DOC: capitalize Python as proper noun

[erictleung]

• closes #xxxx
• tests added / passed
• passes black pandas
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[MarcoGorelli]

Thanks - can you also fix this in other doc pages, such as doc/source/ecosystem.rst and doc/source/user_guide/cookbook.rst? There's a few other places where it appears uncapitalised

[erictleung]

Thanks - can you also fix this in other doc pages, such as doc/source/ecosystem.rst and doc/source/user_guide/cookbook.rst? There's a few other places where it appears uncapitalised

@MarcoGorelli sure thing! I ran:

grep python -r *
grep jupyter -r *

in the doc/source/ directory to find instances and changed them. I also found some other random capitalizations along the way.

I didn't touch anything in the whatsnew/ directory.

[erictleung]

@MarcoGorelli hopefully got them now! Thanks for the suggestions. (Side note, just realized I can't spell my branches right and caused me some confusion while making edits 😅)

[MarcoGorelli]

cool, thanks!

[jreback]

thanks @erictleung