remove comment about syncing versions #1445
Description
This comment in pom.xml no longer seems to be true. At least we haven't done this for a while:
<!--
NOTE: if you make a change to these versions, you MUST make the same change to:
- google-api-client-assembly/android-properties (make the filenames match the version here)
- google-oauth-java-client/pom.xml (versions must match)
- google-oauth-java-client/google-oauth-client-assembly/android-properties (make the filenames match the version here)
- google-http-java-client/pom.xml (versions must match)
- google-http-java-client/google-http-client-assembly/android-properties (make the filenames match the version here)
- Internally, update the default features.json file
-->