Docs: Use cross-reference to os.uname in sysconfig.get_platform (#122083)

Author: scop

Doc/library/sysconfig.rst

@@ -376,7 +376,7 @@ Other functions
 
    This is used mainly to distinguish platform-specific build directories and
    platform-specific built distributions.  Typically includes the OS name and
-   version and the architecture (as supplied by 'os.uname()'), although the
+   version and the architecture (as supplied by :func:`os.uname`), although the
    exact information included depends on the OS; e.g., on Linux, the kernel
    version isn't particularly important.