📖 Updating clusterawsadm Docs

[luthermonson]

What this PR does / why we need it:
cluster-api-provider-aws now releases windows binaries for clusterawsadm. This updates the curl links to be v2.0.0+ which has windows binaries in it's releases. Additionally this splits the *nix examples from the windows example and shows how to use clusterawsadm in powershell.

[stmcginnis]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 01b1f11acfe06b349d770b7fa1c3899e65ceccd8

[fabriziopandini]

/lgtm
/approve

/cherry-pick release-1.3

[k8s-infra-cherrypick-robot]

@fabriziopandini: once the present PR merges, I will cherry-pick it on top of release-1.3 in a new PR and assign it to you.

In response to this:

/lgtm
/approve

/cherry-pick release-1.3

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini

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[fabriziopandini]

@luthermonson should we backport this to release 1.2 too?

[k8s-infra-cherrypick-robot]

@fabriziopandini: #7814 failed to apply on top of branch "release-1.3":

Applying: updating clusterawsadm docs to use v2.0.0+ which now supports windows binaries
Using index info to reconstruct a base tree...
M	docs/book/src/user/quick-start.md
Falling back to patching base and 3-way merge...
Auto-merging docs/book/src/user/quick-start.md
CONFLICT (content): Merge conflict in docs/book/src/user/quick-start.md
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 updating clusterawsadm docs to use v2.0.0+ which now supports windows binaries
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/lgtm
/approve

/cherry-pick release-1.3

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[sbueringer]

@luthermonson should we backport this to release 1.2 too?

I wonder if the old book(s) are read by users often enough to invest the effort (but of course no objection from my side)

[luthermonson]

i agree that it wont really benefit many to have it in 1.2 or earlier docs, i'd be happy to make the PRs if you want it tho just let me know

[sbueringer]

That being said. A manual cherry-pick PR (given that the automatic cherry-pick failed here: #7814 (comment)) would be good.

Otherwise folks will only see the new documentation after the v1.4 release end of March

@luthermonson Would be great if you can open a PR against release-1.3 for that.