DOC: Fix heading capitalization in doc/source/whatsnew - part5 (#32550)#33568

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WillAyd merged 14 commits intopandas-dev:masterfrom

cleconte987:modify_doc/source/whatsnew5

May 6, 2020

Commits on Apr 15, 2020

Commits on Apr 16, 2020

Commits on Apr 18, 2020

Commits on Apr 20, 2020

Merge remote-tracking branch 'upstream_main_pandas/master' into modify_doc/source/whatsnew5
cleconte987
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Commits on Apr 30, 2020

Merge remote-tracking branch 'upstream_main_pandas/master' into modify_doc/source/whatsnew5
cleconte987
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Move back 'GroupBy' to 'groupby' for methods containing with that name
cleconte987
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Commits on May 2, 2020

Commits on May 5, 2020