fix name of argument in docstring and the docs (closes #25076)

Patch by TAKASE Arihiro.

Doc/distutils/apiref.rst

@@ -521,7 +521,7 @@ This module provides the following functions.
 
    .. method:: CCompiler.library_option(lib)
 
-      Return the compiler option to add *dir* to the list of libraries linked into the
+      Return the compiler option to add *lib* to the list of libraries linked into the
       shared library or executable.
 
 

Lib/distutils/ccompiler.py

@@ -752,7 +752,7 @@ class CCompiler:
         raise NotImplementedError
 
     def library_option(self, lib):
-        """Return the compiler option to add 'dir' to the list of libraries
+        """Return the compiler option to add 'lib' to the list of libraries
         linked into the shared library or executable.
         """
         raise NotImplementedError