index.html: corrected checkout command when submitting fixesHEADmaster

Until now, the part of 'index.html' that instructed how to submit
fixes incorrectly asked users to use 'git branch -b', but this should
have been 'git checkout -b'. Also, we didn't have a step to make sure
the local 'maneage' branch is up to date.

With this commit, both issues have been addressed.

This problem was reported by Faezeh Bidjarchian.

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