Fix typo in contribution guide's page section
Fix typo in contribution guide's page section

This fixes the assumed copy & paste typo in the Pad pages section:
https://github.com/komarserjio/notejam/blob/master/contribute.rst#pages

hstaugaard/notejam,williamn/notejam,williamn/notejam,hstaugaard/notejam,hstaugaard/notejam,williamn/notejam,williamn/notejam,hstaugaard/notejam,hstaugaard/notejam,hstaugaard/notejam,williamn/notejam,williamn/notejam,hstaugaard/notejam,williamn/notejam,hstaugaard/notejam