RS: 7.22.0 August maintenance release notes (#1980)

* DOC-5570 RS: Created RS 7.22.0 August maintenance release notes draft

* DOC-5570 RS: Added resolved issues and highlights to RS 7.22.0 August maintenance release notes draft

* DOC-5565 Removed RS165532 from 7.22.0 Aug maintenance release resolved issues

* DOC-5570 Added RS166727 to resolved issues for RS 7.22.0 August maintenance release

* DOC-5570 Added build number to RS 7.22.0 August maintenance release notes

* DOC-5570 Added checksums to RS 7.22.0 August maintenance release notes

Author: rrelledge