Update active PMC members and committers

Author: Jagadish <[email protected]>

Reviewers: Jagadish<[email protected]>

Closes apache#712 from vjagadish1989/website-reorg9

Author: jagadish-v0

docs/_committers/angela-murrell.md

@@ -20,7 +20,7 @@
    limitations under the License.
 -->
 
-A list of people who have contributed to Samza
+Samza is developed by a friendly community of contributors. The Samza Project Management Committee(PMC) is responsible for the management and oversight of the project.
 
 <hr class="committers-hr"/>