Updated the PR list for a feature (#1023)

Updated the PR list for SONiC Generic Update and Rollback feature as it is missed.

doc/SONiC_202111_Release_Notes.md

@@ -197,7 +197,7 @@ Refer [HLD document](https://github.com/Azure/SONiC/blob/dc4a7ae5be75e8e376f9e95
 The SONiC Generic Update and Rollback feature is to standardize the way to do partial updates, to take checkpoints and finally to rollback the configurations for SONiC.
 
 Refer [HLD document](https://github.com/ghooo/SONiC/blob/c1f3f3b5427d0cafb3defd93df8b906a26fcee8a/doc/config-generic-update-rollback/SONiC_Generic_Config_Update_and_Rollback_Design.md) and below mentioned PR's for more details. 
-<br> **Pull Requests** : [736](https://github.com/Azure/SONiC/pull/736)
+<br> **Pull Requests** : [736](https://github.com/Azure/SONiC/pull/736), [1536](https://github.com/Azure/sonic-utilities/pull/1536), [1599](https://github.com/Azure/sonic-utilities/pull/1599),  [1762](https://github.com/Azure/sonic-utilities/pull/1762),  [1794](https://github.com/Azure/sonic-utilities/pull/1794),  [1831](https://github.com/Azure/sonic-utilities/pull/1831),  [1856](https://github.com/Azure/sonic-utilities/pull/1856),  [1864](https://github.com/Azure/sonic-utilities/pull/1864),  [1885](https://github.com/Azure/sonic-utilities/pull/1885),  [1901](https://github.com/Azure/sonic-utilities/pull/1901),  [1919](https://github.com/Azure/sonic-utilities/pull/1919),  [1923](https://github.com/Azure/sonic-utilities/pull/1923),  [1929](https://github.com/Azure/sonic-utilities/pull/1929),  [1934](https://github.com/Azure/sonic-utilities/pull/1934),  [1969](https://github.com/Azure/sonic-utilities/pull/1969),  [1973](https://github.com/Azure/sonic-utilities/pull/1973),  [1977](https://github.com/Azure/sonic-utilities/pull/1977),  [1981](https://github.com/Azure/sonic-utilities/pll/1981),  [1983](https://github.com/Azure/sonic-utilities/pull/1983),  [1987](https://github.com/Azure/sonic-utilities/pull/1987),  [1988](https://github.com/Azure/sonic-utilities/pull/1988),  [2003](https://github.com/Azure/sonic-utilities/pull/2003),  [2006](https://github.com/Azure/sonic-utilities/pull/2006),  [2008](https://github.com/Azure/sonic-utilities/pull/2008),  [2015](https://github.com/Azure/sonic-utilities/pull/2015),  [2020](https://github.com/Azure/sonic-utilities/pull/2020) & [2028](https://github.com/Azure/sonic-utilities/pull/2028) 
 
 #### SRv6 support (Cntd)           
 SRv6 has been widely adopted as an IPv6 based SDN solution, which provides programming ability, TE capabilities, and deployment simplicity to network administrators. With current support from a rich ecosystem, including major ASIC manufactures, networking vendors and open source communities, the deployment of SRv6 is accelerating. This implentation adds SRv6 into SONIC to benefit users in DC as well as beyond DC.