Merge pull request #8874 from ISISComputingGroup/rerpha-patch-1

add NDXMUX and NDXMEIS to all instrument task template

Author: Tom-Willemsen

.github/ISSUE_TEMPLATE/generic-all-instrument-template.md

@@ -158,6 +158,9 @@ assignees: ''
 - ### NDXSANDALS
   - [ ] Started
   - [ ] Completed
+- ### NDXMUX
+  - [ ] Started
+  - [ ] Completed
 - ### NDXENGINX_SETUP
   - [ ] Started
   - [ ] Completed