bpo-40471: Fix grammar typo in 'issubclass' docstring

[alexpovel]

Just a brief grammar fix.

See also https://bugs.python.org/issue40471.

https://bugs.python.org/issue40471

Automerge-Triggered-By: @orsenthil

[remilapeyre]

Thanks for making the change @alexpovel !

While we are fixing this docstring, maybe we should change

This is equivalent to issubclass(x, A) or issubclass(x, B) or ... etc.

to

This is equivalent to issubclass(x, A) or issubclass(x, B) or ....

as it looks to me like ... and etc are redundant.

[alexpovel]

@remilapeyre , what do you think about

A tuple, as in issubclass(x, (A, B, ...)), may be given as the target to
check against. This is equivalent to issubclass(x, A) or issubclass(x, B) or issubclass(x, ...) etc.

This seems to read fluently and be in line with the preceding sentence.

Otherwise, I agree with you and will update the PR with your suggestion.

[remilapeyre]

Not sure about the wording with ... in the call to issubclass() as the part that gets repeated is the whole issubclass(x, A), not just the arguments.

[alexpovel]

Okay! The PR is updated according to your original suggestion.

[remilapeyre]

Thanks @alexpovel, looks great!

[corona10]

@alexpovel

Sorry for the delayed.
Please rebase your PR to solve the conflict :)

[alexpovel]

@corona10 Done!

[miss-islington]

Sorry, I can't merge this PR. Reason: Base branch was modified. Review and try the merge again..

[miss-islington]

Sorry, I can't merge this PR. Reason: Base branch was modified. Review and try the merge again..

[miss-islington]

Sorry, I can't merge this PR. Reason: Pull Request is not mergeable.

[miss-islington]

Thanks @alexpovel for the PR 🌮🎉.. I'm working now to backport this PR to: 3.7, 3.8, 3.9.
🐍🍒⛏🤖

[miss-islington]

Sorry, @alexpovel, I could not cleanly backport this to 3.9 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker df773f8c5454acebe08c31e7308597fa5a8bf5df 3.9

[miss-islington]

Sorry @alexpovel, I had trouble checking out the 3.8 backport branch.
Please backport using cherry_picker on command line.
cherry_picker df773f8c5454acebe08c31e7308597fa5a8bf5df 3.8

[miss-islington]

Sorry, @alexpovel, I could not cleanly backport this to 3.7 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker df773f8c5454acebe08c31e7308597fa5a8bf5df 3.7

[orsenthil]

The fix can be ported to other maintained versions of python (3.9, 3.8, 3.7). It looks like automated backport failed.

@alexpovel , would you like to create backport PRs as suggested by the bot?