DEVPROD-11598 Add to generate token FAQ about go private modules (#8341)

docs/FAQ.md

@@ -44,3 +44,7 @@ A few things may cause this issue:
 - There may be a typo in the owner or repository used when generating the token. Look for the log that says `creating github dynamic access token for 'owner/repo'` and copy/paste it into github to ensure that the owner/repo exist and are spelled correctly.
 - Parts of the evergreen system or github may be down.
 - There may be something wrong with the github app ID or the github app key saved in [project settings](Github-Integrations#dynamic-github-access-tokens).
+
+##### How can I use a generated token for private go modules?
+
+After using the github.generate_token command to generate a token, you can then use it in a global git config with something like `git config --global url."https://x-access-token:${generated_token}@github.com/".insteadOf https://github.com/`. Evergreen will reset the global git config at the end of tasks (or for task groups, after the all the tasks in the task group tasks have finished).