[docs] [issue30208] Small typos in IDLE doc

[Cheryl Sabella]

Cheryl Sabella added the comment:

I followed the steps for cherry-pick, but messed up a little as I made 3 PRs instead of one.  However, I couldn't do the labels asked for in this section:

When a cherry-pick was applied successfully, this script will open up a browser tab that points to the pull request creation page.

The url of the pull request page looks similar to the following:

https://github.com/python/cpython/compare/3.5...<username>:backport-6de2b78-3.5?expand=1

    Apply the appropriate cherry-pick for ... label
    Press the Create Pull Request button.
    Remove the needs backport to ... label from the original pull request against master.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30208>
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