Change Context ref to meth directive.

Author: felixxm

Doc/library/decimal.rst

@@ -264,7 +264,7 @@ allows the settings to be changed.  This approach meets the needs of most
 applications.
 
 For more advanced work, it may be useful to create alternate contexts using the
-``Context()`` constructor.  To make an alternate active, use the :func:`setcontext`
+:meth:`Context` constructor.  To make an alternate active, use the :func:`setcontext`
 function.
 
 In accordance with the standard, the :mod:`decimal` module provides two ready to