Fixed typo in documentation

Author: kmvanbrunt

cmd2/argparse_custom.py

@@ -192,10 +192,10 @@ def my_completer_method(self, text, line, begidx, endidx, arg_tokens)
 completion and enables nargs range parsing. See _add_argument_wrapper for
 more details on these arguments.
 
-``argparse.ArgumentParser._get_nargs_pattern`` - adds support to for nargs
-ranges. See _get_nargs_pattern_wrapper for more details.
+``argparse.ArgumentParser._get_nargs_pattern`` - adds support for nargs ranges.
+See _get_nargs_pattern_wrapper for more details.
 
-``argparse.ArgumentParser._match_argument`` - adds support to for nargs ranges.
+``argparse.ArgumentParser._match_argument`` - adds support for nargs ranges.
 See _match_argument_wrapper for more details.
 """