Andrew Gerrand 4a8c15e066 doc: revise help page with categories and more links
Fixes #12489

Change-Id: I25dd3f76e4cfe9a71b987c3b31445724568391e9
Reviewed-on: https://go-review.googlesource.com/18625
Reviewed-by: Russ Cox <rsc@golang.org>
2016-01-14 03:15:39 +00:00
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