Fix typos related to policy rewrite

[justinretzolk]

Description

This PR fixes a few more typos that were introduced in the recent large rewriting of IAM policies switching away from heredoc format.

Relations

Closes #29872
Closes #29858
Closes #29855

References

#29360
#29354
#29356

Output from Acceptance Testing

N/a, docs

[github-actions]

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[gdavison]

Looks good! 🚀

[github-actions]

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[github-actions]

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