Merge pull request #353 from tldr-pages/add-m-syntax-to-python-page

Adds -m syntax to python page

pages/common/python.md

@@ -13,3 +13,7 @@
 - Execute Python language single command
 
 `python -c {{command}}`
+
+- Run library module as a script (terminates option list)
+
+`python -m {{module}} {{arguments}}`