[3.12] gh-127852: add remark about ',' separator (GH-127854) (#127942)

Specify that it is valid for floats and ints with 'd' presentation and an error otherwise.
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(cherry picked from commit e2325c9)

Co-authored-by: Sergey B Kirpichev <[email protected]>
Co-authored-by: Terry Jan Reedy <[email protected]>

Author: 3 people

Doc/library/string.rst

@@ -409,7 +409,9 @@ conversions, trailing zeros are not removed from the result.
 
 .. index:: single: , (comma); in string formatting
 
-The ``','`` option signals the use of a comma for a thousands separator.
+The ``','`` option signals the use of a comma for a thousands separator for
+floating-point presentation types and for integer presentation type ``'d'``.
+For other presentation types, this option is an error.
 For a locale aware separator, use the ``'n'`` integer presentation type
 instead.