[FABCI-258] Fixed doc link
[FABCI-258] Fixed doc link

Fixed the docs badge
link to point to the release branch
of the doc. Also added a link to the
Hyperledger Fabric rocket chat

Change-Id: Icbe64888496ffda046d4e2668bd0caf100875454
Signed-off-by: pama-ibm <9b2a4f3779f0d8bc1012e1b1b041a4315ea7477e@ibm.com>

xixuejia/fabric,xixuejia/fabric,xixuejia/fabric