bpo-36549: str.capitalize now titlecases the first character instead of uppercasing it

[skrungly]

this PR slightly tweaks the behaviour of str.capitalize so that it puts the first character into titlecase rather than uppercase. this only really changes the result for strings starting with digraphs or ligatures.

this my first contribution here so i hope everything is correct! :) i wasn't too sure exactly which part of the documentation needed to be changed so i just put what i assumed was right.

https://bugs.python.org/issue36549

https://bugs.python.org/issue36549

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[zooba]

Code changes look good, just need the CLA to come through

[ZackerySpytz]

I think this may have been merged too soon. Serhiy had made a list on the bug tracker (https://bugs.python.org/issue36549#msg339878), and I think that this PR was missing some necessary changes.

[skrungly]

I think that this PR was missing some necessary changes.

if you don't mind me asking, what did i miss? i thought i had tackled all of the points made on the bug tracker :)