gh-69619: Clarify str.{l,r}strip() documentation

[kyo5uke]

str.strip() documents that whitespace is defined by str.isspace(), but str.lstrip() and str.rstrip() did not mention it. This adds the same sentence to both so the three methods are described consistently.

Documentation-only change.

Relates to #69619

• Issue: whitespace in strip()/lstrip()/rstrip() #69619

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Documentation build overview

📚 cpython-previews | 🛠️ Build #33014459 | 📁 Comparing e0bc5ec against main (6b24376)

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9 files changed · ± 9 modified

± Modified

• c-api/complex.html
• extending/first-extension-module.html
• library/difflib.html
• library/io.html
• library/shlex.html
• library/stdtypes.html
• using/windows.html
• whatsnew/3.16.html
• whatsnew/changelog.html

[kyo5uke]

Thanks @picnixz! I inlined the note in both str.lstrip and str.rstrip as suggested.

[kyo5uke]

Thanks @picnixz! Applied the same inline phrasing to str.strip so all three (strip / lstrip / rstrip) now read "defaults to removing whitespace, that is characters for which str.isspace is true", and dropped the separate sentence.

[picnixz]

Usually, one should ping maintainers after a while, say 1 month, if the first ping doesn't help. Maintainers have limited bandwidth and we can't reply the same day or the following.

[kyo5uke]

Thanks for the review and the approval — really appreciate it. Understood about maintainer bandwidth; I'll be patient. Thanks again for taking the time.

[picnixz]

@StanFromIreland You reviewed the orignal PR on str.strip(). Are you ok with my wording changes?