add NDXMUX and NDXMEIS to all instrument task template

Add NDXMUX and NDXMEIS sections to the issue template.

Author: rerpha

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

@@ -158,6 +158,12 @@ assignees: ''
 - ### NDXSANDALS
   - [ ] Started
   - [ ] Completed
+- ### NDXMUX
+  - [ ] Started
+  - [ ] Completed
+- ### NDXMEIS
+  - [ ] Started
+  - [ ] Completed
 - ### NDXENGINX_SETUP
   - [ ] Started
   - [ ] Completed