Fix trailing whitespace.

Author: Arch D. Robison

doc/manual/mathematical-operations.rst

@@ -357,8 +357,8 @@ handling of inexact conversions.
 
 - The notation ``T(x)`` or ``convert(T,x)`` converts ``x`` to a value of type ``T``.
 
-  -  If ``T`` is a floating-point type, the result is the nearest representable 
-     value, which could be positive or negative infinity.  
+  -  If ``T`` is a floating-point type, the result is the nearest representable
+     value, which could be positive or negative infinity.
 
   -  If ``T`` is an integer type, an ``InexactError`` is raised if ``x``
      is not representable by ``T``.