Clarify references to releases vs cycles and updates deprecation reference links

Why is this change being made?

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mentioned in merge request !76793 (merged)

changed milestone to %13.10

added Product Operations prodops:release release post labels

requested review from @ljlane

changed title from Clarify references to releases vs cycles to Clarify references to releases vs cycles and updates deprecation reference links

assigned to @ljlane

resolved all threads

added this merge request to the merge train at position 3

I'm merging this @fseifoddini now that we have gitlab-org/Product#188 (moved) to discuss the one open question.

merged

mentioned in commit 5ac0ad33