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

Patch by TAKASE Arihiro.

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