[FAB-12188] Broken links in Whats new doc

Release note links need to formatted
correctly and changed.

Change-Id: I474b66c49e775812f169ab5a0e9a6628233097cf
Signed-off-by: joe-alewine <Joe.Alewine@ibm.com>

Author: joe-alewine

docs/source/whatsnew.rst

@@ -58,8 +58,8 @@ that made up these changes (in addition to other hygiene/performance/bug fixes
 we did not explicitly document), check out the release notes. Note that these
 links will not work on the release candidate, only on the GA release.
 
-* [Fabric release notes](https://github.com/hyperledger/fabric/releases/tag/v1.3.0).
-* [Fabric CA release notes](https://github.com/hyperledger/fabric-ca/releases/tag/v1.3.0).
+* `Fabric release notes <https://github.com/hyperledger/fabric/releases/tag/v1.3.0-rc1>`_.
+* `Fabric CA release notes <https://github.com/hyperledger/fabric-ca/releases/tag/v1.3.0-rc1>`.
 
 .. Licensed under Creative Commons Attribution 4.0 International License
    https://creativecommons.org/licenses/by/4.0/