Update Slack link; minor wording change to intro

Update Slack link to the URL that actually lets you join w/o an invitation (hopefully this won't attract spam)

docs/PrinciplesReviewWorkflow.md

@@ -3,7 +3,7 @@ layout: doc
 title: Principle Review Process
 ---
 
-This page describes the process for reviewing, updating, and creating [OBO Foundry Principles](http://obofoundry.github.io/principles/fp-000-summary.html) by the OBO Foundry Editorial Working Group (EWG).
+This page describes the process for reviewing, updating, and creating [OBO Foundry Principles](http://obofoundry.github.io/principles/fp-000-summary.html). Most of the steps are done by the OBO Foundry Editorial Working Group (EWG).
 
 For the following, steps 1-5 are internal to the EWG and steps 6-7 are internal to the OBO Operations Committee. 
 
@@ -14,7 +14,7 @@ For the following, steps 1-5 are internal to the EWG and steps 6-7 are internal
 5. If necessary, discuss changes made during the commenting period and finalize the text.
 6. Once the EWG agrees on a final version, a member presents the text to the OBO Foundry Operations Committee for discussion during a meeting or via the issue tracker.
 7. Once the wording is approved by OBO Operations, a member of the EWG makes a pull request reflecting the consensus of previous discussions. Note that the pull request should be marked as 'draft' if it is a new principle.
-8. For new principles or major changes to existing principles, announce the proposal on the [obo-discuss mailing list](mailto:[email protected]) and the [obo-community #general Slack channel](https://app.slack.com/client/T01BAB621JR/C01BDKWDS91) and request public feedback.
+8. For new principles or major changes to existing principles, announce the proposal on the [obo-discuss mailing list](mailto:[email protected]) and the [obo-community #general Slack channel](https://join.slack.com/t/obo-communitygroup/shared_invite/zt-1oq48ttk7-kKo0i6TwntYtAq~Jcjjg4g) and request public feedback.
 9. Allow a two-week commenting period on the pull request.
 10. If the feedback includes major changes or objections, re-discuss during an OBO Operations call and re-do any relevant steps indicated above.
 11. At the end of the commenting period, assuming no major changes are needed, a member of the EWG will merge the pull request (removing 'draft' status if appropriate) and thereby make the changes public.