Backport to 6.x: Multiple doc changes (#7696 #7883 #7888 #7889 #7903 #7937 #7939 #7948 #7949 #7950) #8188
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Replaces #8011
Cherry-picks the following doc PRs into the 6.x branch. Note that running make update resulted in some updates I wasn't expecting. Need someone to confirm that they are good for 6.x. Don't seem related the changes in cherry-picked PRs.
#7696
#7883
#7888
#7889
#7903
#7937
#7939
#7948
#7949
#7950