[3.12] gh-124832: Add a note to indicate that datetime.now may return the same instant (GH-124834)

[miss-islington]

• Update datetime.rst

• Update datetime.rst

replace warning with note

• Update Doc/library/datetime.rst

Co-authored-by: Victor Stinner [email protected]

• Update Doc/library/datetime.rst

Co-authored-by: Bénédikt Tran [email protected]

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(cherry picked from commit 760b1e1)

Co-authored-by: spacemanspiff2007 [email protected]
Co-authored-by: Victor Stinner [email protected]
Co-authored-by: Bénédikt Tran [email protected]

• Issue: Subsequent datetime.now() calls return the same datetime #124832

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