gh-126719: Improve math.fmod documentation.

Doc/library/math.rst

@@ -248,16 +248,16 @@ Floating point arithmetic
 
 .. function:: fmod(x, y)
 
-   Return ``fmod(x, y)``, as defined by the platform C library. Note that the
-   Python expression ``x % y`` may not return the same result.  The intent of the C
-   standard is that ``fmod(x, y)`` be exactly (mathematically; to infinite
-   precision) equal to ``x - n*y`` for some integer *n* such that the result has
-   the same sign as *x* and magnitude less than ``abs(y)``.  Python's ``x % y``
-   returns a result with the sign of *y* instead, and may not be exactly computable
-   for float arguments. For example, ``fmod(-1e-100, 1e100)`` is ``-1e-100``, but
-   the result of Python's ``-1e-100 % 1e100`` is ``1e100-1e-100``, which cannot be
-   represented exactly as a float, and rounds to the surprising ``1e100``.  For
-   this reason, function :func:`fmod` is generally preferred when working with
+   Return the remainder of division ``x / y``, as defined by the platform C library
+   function ``fmod(x, y)``. Note that the Python expression ``x % y`` may not return
+   the same result.  The intent of the C standard is that ``fmod(x, y)`` be exactly
+   (mathematically; to infinite precision) equal to ``x - n*y`` for some integer *n*
+   such that the result has the same sign as *x* and magnitude less than ``abs(y)``.
+   Python's ``x % y`` returns a result with the sign of *y* instead, and may not be
+   exactly computable for float arguments. For example, ``fmod(-1e-100, 1e100)``
+   is ``-1e-100``, but the result of Python's ``-1e-100 % 1e100`` is ``1e100-1e-100``,
+   which cannot be represented exactly as a float, and rounds to the surprising ``1e100``.
+   For this reason, the function :func:`fmod` is generally preferred when working with
    floats, while Python's ``x % y`` is preferred when working with integers.