Update sources/29-web2py-english/09.markmin

Replaced the abandoned facebook module by a forked project. The original link is broken
typos
Merge pull request #28 from nicozanf/master

Added Support and Contribute paragraphs, PythonAnywhere polishings and small typos
Merge pull request #29 from spametki/master

An alternative download link for Facebook's GraphAPI
edited acknowledgements
jsonrpc2
fixed 100->100.0, thanks Niphlod
fixed pgp, thanks Martin
minor changes and typos