docs: recommend 3.5.32 before upgrading to 3.6

[locker95]

The 3.5→3.6 upgrade guide still said patch to 3.5.26. The July release (3.5.32 / 3.6.13) is what brings write-only-skip-check and the WAL-aware etcdutl check v2store, which the same page already walks through.

Bumped the checklist to 3.5.32 and linked the July blog.

Fixes #1194

[kubernetes-prow]

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[kubernetes-prow]

Hi @locker95. Thanks for your PR.

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