Fix editorial errors

Modify ONPA by ONAP
Correct some JSON file example
Add code-block for code snippet

Change-Id: Ia313b6adc615bcd353f4e3c3e363c3f854d25181
ISSUE-ID: DCAEGEN2-199
Signed-off-by: Eric Debeau <eric.debeau@orange.com>
5 files changed