[FAB-13288] BYFN manual step fixes
[FAB-13288] BYFN manual step fixes

The manual steps in the BYFN doc were failing when a query was issued
against a peer that hadn't joined the channel. This was fixed, along
with other minor typos.

Change-Id: I7732784d0dd800fd2f2ff0edf34f4989e26c3cab
Signed-off-by: Alessandro Sorniotti <f32b00f17cd31d4086a37e20e6815a9429f62787@sopit.net>

xixuejia/fabric,xixuejia/fabric,xixuejia/fabric