[FAB-4581] Correct gossip core.yaml comments
[FAB-4581] Correct gossip core.yaml comments

There are some comments that are simply incorrect and some have
grammar errors.

Change-Id: Ib606ba9735d24028480a3123307bca81a179dd68
Signed-off-by: Yacov Manevich <632344b5da9bd743456189af4db4b56472defb8c@il.ibm.com>

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