Update discord channel name

Author: camerondubas

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,6 +4,6 @@ Thanks for submitting a pull request! 🎉
 
 Please include a link to a GitHub issue if one exists.
 
-If you don't hear from a maintainer within a few days, please feel free to ping us here or in #e-typescript on Discord!
+If you don't hear from a maintainer within a few days, please feel free to ping us here or in #topic-typescript on Discord!
 
 -->

docs/ts/current-limitations.md

@@ -6,7 +6,7 @@ While TS already works nicely for many things in Ember, there are a number of co
 
 You'll frequently see errors for imports which TypeScript doesn't know how to resolve. **These won't stop the build from working;** they just mean TypeScript doesn't know where to find those.
 
-Writing these missing type definitions is a great way to pitch in! Jump in `#e-typescript` on the [Ember Community Discord server](https://discord.gg/zT3asNS) and we'll be happy to help you.
+Writing these missing type definitions is a great way to pitch in! Jump in `#topic-typescript` on the [Ember Community Discord server](https://discord.gg/zT3asNS) and we'll be happy to help you.
 
 ## Templates
 

known-typings.md

@@ -5,7 +5,7 @@ course find many other modules with their own typings out there.)
 
 Don't see an addon you use listed here? You might be the one to write them! Check
 out [this blog post] or [this quest issue] for tips on how to do it, and feel free
-to ask for help in the `#e-typescript` channel on the [Ember Community Discord server].
+to ask for help in the `#topic-typescript` channel on the [Ember Community Discord server].
 
 [this blog post]: http://www.chriskrycho.com/2017/typing-your-ember-part-5.html
 [this quest issue]: https://github.com/typed-ember/ember-typings/issues/14

rfcs/README.md

@@ -81,7 +81,7 @@ for inclusion by ember-cli-typescript.
 * RFCs that are candidates for inclusion will enter a "final comment period"
 lasting 7 days. The beginning of this period will be signaled with a comment
 and tag on the RFC's pull request. Furthermore, the Typed Ember team will post
-in Discord in `#e-typescript` and `#news-and-announcements`.
+in Discord in `#topic-typescript` and `#news-and-announcements`.
 * An RFC can be modified based upon feedback from the Typed Ember team and
 the community. Significant modifications may trigger a new final comment period.
 * An RFC may be rejected by the team after public discussion has settled and