doc: Revise Contribution Guidelines.
Smooth out the setup process for new contributors. * Remove references $GOROOT (often not defined). * Add a note for contributing to subrepositories. * Emphasize that hg mail also uploads the latest copy. LGTM=adg R=golang-codereviews, iant, adg CC=golang-codereviews https://golang.org/cl/74370043
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