doc: use pure environment when building from git

* doc/contributing.texi (Building from Git): Add --pure to "guix environment"
  invocations

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
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Giovanni Biscuolo 2019-05-15 10:28:40 +02:00 committed by Ludovic Courtès
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@ -57,14 +57,14 @@ all the dependencies and appropriate environment variables are set up to
hack on Guix:
@example
guix environment guix
guix environment guix --pure
@end example
@xref{Invoking guix environment}, for more information on that command.
Extra dependencies can be added with @option{--ad-hoc}:
@example
guix environment guix --ad-hoc help2man git strace
guix environment guix --pure --ad-hoc help2man git strace
@end example
Run @command{./bootstrap} to generate the build system infrastructure