Documentation Improvements

[Bibo-Joshi]

Gathering smaller doc fixes to be merged before the next release.

Mention the following contributions in the commit message:

• Fix formatting in 20.0a1 changelog #3708
• Remove obsolete note from contributing guidelines #3767

[github-actions]

Hey! Looks like you edited README.rst or README_RAW.rst. I'm just a friendly reminder to apply relevant changes to both of those files :)

[b-gleb]

I've also noticed a wrong comment in one of the examples:

python-telegram-bot/examples/inlinebot.py

Lines 98 to 99 in 1a7edd7

	# on non command i.e message - echo the message on Telegram
	application.add_handler(InlineQueryHandler(inline_query))

Should say something along the lines of "on inline query - parse query" instead.

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Do you want a separate issue for that or this comment is enough?

[b-gleb]

Link in the see also section is wrong.

python-telegram-bot/telegram/ext/_jobqueue.py

Line 670 in bfbf6d3

.. seealso:: :wiki:`Job Queue <Extensions-%E2%80%93-JobQueue>`

Correct link: Extensions---JobQueue