github_pat needs more information

[duttonw]

When using github_pat docs say you need to generate a 'personal access token' for cross repo commits.

Then you need to set a secret in the repo and its not just the token that was generated. It needs to be username:token so if your username is abc and the token is 234234234lkj2 then in the repo set for github_pat is abc:234234234lkj2

else it won't work because it can't find the password.

I've spent 1 hour trying to work out why it would not cross commit and it was because i was missing my username.