Add comment pointing to maven docs on compiler config bits.
@@ -14,6 +14,11 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
+<!--
+For an explanation of why this is set, see the maven docs:
+
+https://maven.apache.org/plugins/maven-compiler-plugin/examples/set-compiler-source-and-target.html
+-->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
