Make text style in "Gitolite" section consistent with other sections.
Fix inconsistency between an example and its description
Change 'authorisation' to 'authorization'

as SSH has 'authorized_keys' file.
Make Gitolite setup examples clearer.

Also replace 'sitaram' username with 'scott' for the sake of consistency.
Merge pull request #369 from GArik/EN

Corrections to the Gitolite section