Document various functions in congregate/migration/gitlab
Go through each function in congregate/migration/gitlab (not including congregate/migration/gitlab/api/*) and add a docstring to functions lacking one. Refer to api.py for a reference format.
For any functions with unknown functionality, post a comment in the issue at-mentioning the author of that function.
To find the author run git blame <path-to-file>
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Edited by Petar Prokić