Update readthedocs to require csr.json on enroll
Update readthedocs to require csr.json on enroll

See https://jira.hyperledger.org/browse/FAB-1942
This updates the 2 enroll commands per description
in fab-1942 and also fixes some formatting
issues in appendix.

Change-Id: I8cc80b99cb5534f660e9d6286b9926cbfa98e6b8
Signed-off-by: Keith Smith <0f8efcf9aed721c212c631c567e094685b5cc962@us.ibm.com>

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