Add component owner notes (#266)

* Add component owner notes

* more

Author: trask

.github/component_owners.yml

@@ -1,4 +1,14 @@
 # this file is used by .github/workflows/component-codeowners.yml
+#
+# NOTE component owners must be members of the GitHub OpenTelemetry organization
+# so that they can be added to @open-telemetry/java-contrib-triagers
+# which in turn is required for them to be auto-assigned as reviewers by the automation
+#
+# NOTE when updating this file, don't forget to update the README.md files in the associated
+# components also
+#
+# NOTE when adding/updating one of the component names, don't forget to update the associated
+# `comp:*` labels
 components:
   aws-xray:
     - anuraaga