Update release.md

Author: SethTisue

.github/ISSUE_TEMPLATE/release.md

@@ -115,6 +115,7 @@ Key links:
 - [ ] ask Seth to announce on #scala IRC
 
 ### Afterwards
+- [ ] Create PR to update `scala-version` on docs.scala-lang.org (example: https://github.com/scala/docs.scala-lang/pull/1294)
 - [ ] Create PR to update `versions.properties` (new file generated by the bootstrap job) and the `baseVersion` in `build.sbt`
 - [ ] Create PR to update https://github.com/lightbend/reactive-platform-docs/blob/master/src/main/paradox/supported-modules/index.md
 - [ ] Update [WhiteSource](https://www.whitesourcesoftware.com)