Clarify exported types and ipc.d.ts

Author: code-asher

ci/build/build-release.sh

@@ -22,7 +22,9 @@ main() {
   rsync LICENSE.txt "$RELEASE_PATH"
   rsync ./lib/vscode/ThirdPartyNotices.txt "$RELEASE_PATH"
 
-  # Keep these types since code-server's exported types use them.
+  # code-server exports types which can be imported and used by plugins. Those
+  # types import ipc.d.ts but it isn't included in the final vscode build so
+  # we'll copy it ourselves here.
   mkdir -p "$RELEASE_PATH/lib/vscode/src/vs/server"
   rsync ./lib/vscode/src/vs/server/ipc.d.ts "$RELEASE_PATH/lib/vscode/src/vs/server"
 }