Update issue templates

Remove suggestion to review slack channels spreadsheet

.github/ISSUE_TEMPLATE/vro-engineer-onboarding.md

@@ -62,8 +62,6 @@ This document will streamline your onboarding process and reduce the startup tim
         - [#benefits-vro-devops](https://dsva.slack.com/archives/C04CA47HV96)
         - [#benefits-vro-vagov-526s-to-mas](https://dsva.slack.com/archives/C0519PXPUCR)
         - [`#bep-integration-support2077`](https://dsva.slack.com/archives/C05DUAWDVRQ): private channel, you’ll need to be added.
-    - **Additional channels**
-        - [ ]  Review the [Slack Channels Spreadsheet](https://docs.google.com/spreadsheets/d/1c3e6SVuhVz3q4bh1qf5jj25EmusCd3NVXhDjSIpr9yk/edit#gid=1020923043). Most of these channels are deprecated, and this should be cleaned up. *Note*: You don't have to join all channels; start with `#benefits-vro-*`
 
 ### Microsoft Teams Channels