improve How-to-send-PR docs (#495)
improve How-to-send-PR docs (#495)

Signed-off-by: ashcherbakov <ca681afd35c2012ddb620d7eee6a53369d5e67a5@dsr-company.com>
spivachuk/sovrin-node,TechWritingWhiz/indy-node,spivachuk/sovrin-node,TechWritingWhiz/indy-node,TechWritingWhiz/indy-node,spivachuk/sovrin-node,spivachuk/sovrin-node,TechWritingWhiz/indy-node