docs(js_run_devserver): add note about ibazel issue 100

Author: jbedard

docs/js_run_devserver.md

@@ -206,6 +206,8 @@ def js_run_devserver(
     Supports running with [ibazel](https://github.com/bazelbuild/bazel-watcher).
     Only `data` files that change on incremental builds are synchronized when running with ibazel.
 
+    Note that the use of `alias` targets is not supported by ibazel: https://github.com/bazelbuild/bazel-watcher/issues/100
+
     Args:
         name: A unique name for this target.