fix a typo in actions_organization_secret doc (#953)

website/docs/r/actions_organization_secret.html.markdown

@@ -62,7 +62,7 @@ The following arguments are supported:
 * `secret_name`             - (Required) Name of the secret
 * `encrypted_value`         - (Optional) Encrypted value of the secret using the Github public key in Base64 format.
 * `plaintext_value`         - (Optional) Plaintext value of the secret to be encrypted
-* `visiblity`               - (Required) Configures the access that repositories have to the organization secret.
+* `visibility`              - (Required) Configures the access that repositories have to the organization secret.
                               Must be one of `all`, `private`, `selected`. `selected_repository_ids` is required if set to `selected`.
 * `selected_repository_ids` - (Optional) An array of repository ids that can access the organization secret.