[3.9] Corrections to format precision description. (GH-31291)

Doc/library/string.rst

@@ -424,12 +424,13 @@ When no explicit alignment is given, preceding the *width* field by a zero
 sign-aware zero-padding for numeric types.  This is equivalent to a *fill*
 character of ``'0'`` with an *alignment* type of ``'='``.
 
-The *precision* is a decimal number indicating how many digits should be
-displayed after the decimal point for a floating point value formatted with
-``'f'`` and ``'F'``, or before and after the decimal point for a floating point
-value formatted with ``'g'`` or ``'G'``.  For non-number types the field
+The *precision* is a decimal integer indicating how many digits should be
+displayed after the decimal point for presentation types
+``'f'`` and ``'F'``, or before and after the decimal point for presentation
+types ``'g'`` or ``'G'``.  For string presentation types the field
 indicates the maximum field size - in other words, how many characters will be
-used from the field content. The *precision* is not allowed for integer values.
+used from the field content.  The *precision* is not allowed for integer
+presentation types.
 
 Finally, the *type* determines how the data should be presented.