Fix rate limiting options values

[rileykarson]

Followup to hashicorp/terraform-provider-google#10020

Seems like some of the values were from the EAP/alpha API, but got renamed going to beta (I can see them in internal protos). I didn't catch it in the initial review, "threshold" and "throttle" looked pretty similar as one of four options.

Pulled the text directly from c.g.c. For the ones w/ a well-formatted entry there I removed the list in the inline Description, but for the one where it isn't I used the raw string.

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

compute: corrected an issue in `google_compute_security_policy` where only alpha values for certain enums were accepted

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 2 files changed, 16 insertions(+), 11 deletions(-))
Terraform Beta: Diff ( 2 files changed, 21 insertions(+), 17 deletions(-))
TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[c2thorn]

/gcbrun

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 2 files changed, 16 insertions(+), 11 deletions(-))
Terraform Beta: Diff ( 2 files changed, 21 insertions(+), 17 deletions(-))
TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDataSourceGoogleActiveFolder_default|TestAccDataSourceGoogleForwardingRule|TestAccDataSourceGoogleFolder_byShortName|TestAccDataSourceGoogleFolder_byFullName|TestAccDataSourceGoogleFolder_lookupOrganization|TestAccDataSourceGoogleFolders_basic|TestAccDataSourceGoogleGlobalForwardingRule|TestAccApigeeEnvironmentIamBindingGenerated|TestAccApigeeEnvironmentIamMemberGenerated|TestAccComputeBackendServiceIamBindingGenerated|TestAccComputeBackendServiceIamMemberGenerated|TestAccComputeBackendServiceIamPolicyGenerated|TestAccComputeBackendServiceIamBindingGenerated_withCondition|TestAccComputeBackendServiceIamMemberGenerated_withCondition|TestAccComputeBackendServiceIamPolicyGenerated_withCondition|TestAccCloudbuildWorkerPool_basic|TestAccComputeForwardingRule_internalHttpLbWithMigBackendExample|TestAccComputeForwardingRule_internalTcpUdpLbWithMigBackendExample|TestAccComputeForwardingRule_forwardingRuleGlobalInternallbExample|TestAccComputeForwardingRule_forwardingRuleExternallbExample|TestAccComputeForwardingRule_forwardingRuleBasicExample|TestAccComputeForwardingRule_forwardingRuleL3DefaultExample|TestAccComputeForwardingRule_forwardingRuleInternallbExample|TestAccComputeForwardingRule_forwardingRuleHttpLbExample|TestAccComputeForwardingRule_forwardingRuleRegionalHttpXlbExample|TestAccComputeForwardingRule_update|TestAccComputeForwardingRule_ip|TestAccComputeForwardingRule_networkTier|TestAccComputeGlobalForwardingRule_externalTcpProxyLbMigBackendExample|TestAccComputeGlobalForwardingRule_globalForwardingRuleHttpExample|TestAccComputeGlobalForwardingRule_externalHttpLbMigBackendCustomHeaderExample|TestAccComputeGlobalForwardingRule_globalForwardingRuleInternalExample|TestAccComputeGlobalForwardingRule_globalForwardingRuleExternalManagedExample|TestAccComputeGlobalForwardingRule_privateServiceConnectGoogleApisExample|TestAccComputeGlobalForwardingRule_ipv6|TestAccComputeGlobalForwardingRule_updateTarget|TestAccComputeGlobalForwardingRule_labels|TestAccComputeGlobalForwardingRule_internalLoadBalancing|TestAccComputeInstanceFromMachineImage_basic|TestAccComputeInstanceFromMachineImage_overrideMetadataDotStartupScript|TestAccComputeInstanceFromTemplate_basic|TestAccComputeInstanceFromTemplate_overrideScheduling|TestAccComputeInstanceFromMachineImage_diffProject|TestAccComputeInstanceTemplate_basic|TestAccComputeInstanceTemplate_imageShorthand|TestAccComputeInstanceTemplate_preemptible|TestAccComputeInstanceTemplate_guestAcceleratorSkip|TestAccComputeInstanceTemplate_guestAccelerator|TestAccComputeInstanceTemplate_minCpuPlatform|TestAccComputeInstanceTemplate_soleTenantNodeAffinities|TestAccComputeInstanceTemplate_spot|TestAccComputeInstanceTemplate_ConfidentialInstanceConfigMain|TestAccComputeInstanceTemplate_AdvancedMachineFeatures|TestAccComputeInstanceTemplate_nictype_update|TestAccComputeInstance_scheduling|TestAccComputeInstance_soleTenantNodeAffinities|TestAccComputeInstance_guestAcceleratorSkip|TestAccComputeInstance_guestAccelerator|TestAccComputeInstanceConfidentialInstanceConfigMain|TestAccComputeInstance_resourcePolicyCollocate|TestAccComputeInstance_spotVM|TestAccComputeInstance_spotVM_update|TestAccComputeManagedSslCertificate_managedSslCertificateBasicExample|TestAccComputePacketMirroring_computePacketMirroringFullExample|TestAccComputeRoute_routeIlbExample|TestAccComputeRoute_routeIlbVipExample|TestAccComputeRouterPeer_basic|TestAccComputeRouterPeer_advertiseMode|TestAccComputeRouterPeer_enable|TestAccComputeRouterPeer_bfd|TestAccComputeRouterInterface_basic|TestAccComputeRouterInterface_withTunnel|TestAccComputeSecurityPolicy_withRateLimitOptions|TestAccComputeServiceAttachment_serviceAttachmentBasicExample|TestAccComputeServiceAttachment_serviceAttachmentExplicitProjectsExample|TestAccComputeServiceAttachment_serviceAttachmentBasicExampleUpdate|TestAccComputeVpnGateway_targetVpnGatewayBasicExample|TestAccComputeVpnTunnel_vpnTunnelBasicExample|TestAccComputeVpnTunnel_vpnTunnelBetaExample|TestAccComputeVpnTunnel_regionFromGateway|TestAccComputeVpnTunnel_router|TestAccComputeVpnTunnel_defaultTrafficSelectors|TestAccContainerCluster_withAddons|TestAccContainerCluster_nodeAutoprovisioning|TestAccFolderIamAuditConfig_basic|TestAccFolderIamAuditConfig_update|TestAccFolderIamAuditConfig_addFirstExemptMember|TestAccFolderIamAuditConfig_removeLastExemptMember|TestAccFolderIamAuditConfig_updateNoExemptMembers|TestAccFolderIamBinding_basic|TestAccFolderIamBinding_update|TestAccFolderIamMember_basic|TestAccServiceNetworkingPeeredDNSDomain_basic|TestAccStorageTransferJob_posixSource|TestAccStorageTransferJob_posixSink You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=254264

[c2thorn]

just a reminder to hold off on merging until CI is fixed