Fix typos in documentation

[tirkarthi]

No description provided.

[tirkarthi]

I am not a native English speaker I think it should be "Apple's guidelines" instead of "Apple guidelines" in idlelib.

[matrixise]

Do we need a back port to 3.7?

[tirkarthi]

Except for "guidlines" in idlelib the other two are 3.8 only.

[csabella]

@terryjreedy usually likes to make the IDLE doc fixes into their own separate PR, so you may want to wait for him to comment.

[terryjreedy]

My typo, thanks for catching. Nouns can be used as adjectives, so 'Apple guidelines' is OK, with a slightly different sense from 'Apple's guidelines'. But I will consider opinions on which seems better, especially for beginners.

Changes to idle.rst should not only be backported, but need to be propagated to idlelib/help.html, which change also should be backported. It is easier to do it in a separate PR, which I will do.

[tirkarthi]

Changes to idle.rst should not only be backported, but need to be propagated to idlelib/help.html, which change also should be backported. It is easier to do it in a separate PR, which I will do.

Do you want me to revert idlelib changes from this PR? The other two typos are 3.8 only. Hence backport might require manual work.

[bedevere-bot]

@terryjreedy: Please replace # with GH- in the commit message next time. Thanks!

[terryjreedy]

Follow-up is #13354.

[tirkarthi]

Thanks @terryjreedy