📖 Adds RKE2 to list of providers

[dharmit]

What this PR does / why we need it:
$subject.

Which issue(s) this PR fixes:
Fixes # NA

/area documentation

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[k8s-ci-robot]

Hi @dharmit. Thanks for your PR.

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[dharmit]

/kind documentation

[Danil-Grigorev]

/ok-to-test

[Danil-Grigorev]

/lgtm
Thanks for the update to the docs, leaving to maintainers for approval

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 0d6a5baca31415a9d21c5307020920ddcd9d79bf

[fabriziopandini]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini

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[fabriziopandini]

/cherry-pick release-1.9

[k8s-infra-cherrypick-robot]

@fabriziopandini: once the present PR merges, I will cherry-pick it on top of release-1.9 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.9

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-sigs/prow repository.

[k8s-infra-cherrypick-robot]

@fabriziopandini: #11696 failed to apply on top of branch "release-1.9":

Applying: Adds RKE2 to list of providers
Applying: Sort providers A-Z
Using index info to reconstruct a base tree...
M	docs/book/src/reference/providers.md
Falling back to patching base and 3-way merge...
Auto-merging docs/book/src/reference/providers.md
CONFLICT (content): Merge conflict in docs/book/src/reference/providers.md
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0002 Sort providers A-Z

In response to this:

/cherry-pick release-1.9

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-sigs/prow repository.

[fabriziopandini]

@dharmit if you want this to surface in the current version of the book, please open a manual cherry pick to the 1.9 branch