"peer channel fetch" nows logs its success message at the
info level instead of debug. This CR updates the documentation
accordingly (and also pulls in a few other recent CLI changes
that resulted from running `make help-docs`).

Change-Id: I1c95d41176078d89d1f555d078aa8739e50707e3
Signed-off-by: Will Lahti <wtlahti@us.ibm.com>