1. Correct the description of the g command to match POSIX and our
implementation; it was oversimplified and arguably incorrect.
2. Explicitely compare the behaviour of empty command lists for g,
empty command lists for G, and empty commands because these subtle
differences are quite confusing.
3. Say more precisely what the v and V commands do, avoiding the
fuzzy wording "similar".
All these issues were first pointed out by martijn@.
Feedback and OK martijn@; "diff reads ok" jmc@ on an earlier version.
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