docs: minor copy-edits to releases page #13134
Merged
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Follow-up to #13132 and #11934
Motivation
Modifications
remove duplicated note about breaking changes being listed in the upgrading guide
simplify release cycle section, per k8s style guide
other minor style changes:
put italics around the fact that Argo doesn't use SemVer -- just to be more explicit
replace use of jargon such as "shipped", per k8s style guide
use more consistent language as well
prefer 1 sentence per line of markdown, per style guide
fix some minor grammar issues (missing articles, extra comma, etc)
Verification
make docs
passes