[bug#42793] adding git fetch origin keyring:keyring to contributing.texi

[Joshua Branson]

Hello,

I recently followed the guix manual guide for building guix from git
(great work by the way.  That is an awesome guide).  However, when I
tried to run "make authenticate", or "guix authenticate", or guix git
authenticate 9edb3f66fd807b096b48283debdcddccfea34bad \ "BBB0 2DDF
2CEA F6A8 0D1D E643 A2A0 6DF2 A33A 54FA", I got this error:

guix git: error: Git error: cannot locate remote-tracking branch 'keyring'

After running

#BEGIN_SRC sh
git fetch origin keyring:keyring
#END_SRC

Everything worked.

Thanks,

Joshua

0001-doc-add-command-to-fetch-keyring-branch.patch
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