Fix typos in docs and docstrings (GH-13745)

ccompiler.py

@@ -545,7 +545,7 @@ class CCompiler:
         'extra_preargs' and 'extra_postargs' are implementation- dependent.
         On platforms that have the notion of a command-line (e.g. Unix,
         DOS/Windows), they are most likely lists of strings: extra
-        command-line arguments to prepand/append to the compiler command
+        command-line arguments to prepend/append to the compiler command
         line.  On other platforms, consult the implementation class
         documentation.  In any event, they are intended as an escape hatch
         for those occasions when the abstract compiler framework doesn't