Document RN for Pipelines 1.6.1.

Create a section for 1.6.1 RN below the 1.6 RN section. 

• 1.6 RN
  • New
  • Dep
  • KI
  • FI
  • 1.6.1 RN

The following issues need to be documented:

• https://issues.redhat.com/browse/SRVKP-1687
• https://issues.redhat.com/browse/SRVKP-1783
• https://issues.redhat.com/browse/SRVKP-1804 

Additional reference - 1.6.1 errata.