change duplicate title

Author: shuangela

source/usage-examples.txt

@@ -22,7 +22,7 @@ Usage Examples
    Find Operations </usage-examples/find-operations>
    Write Operations </usage-examples/write-operations>
    Bulk Operations </usage-examples/bulkWrite>
-   Monitor Data Changes </usage-examples/changestream>
+   Watch for Changes </usage-examples/changestream>
    Count Documents Method Example </usage-examples/count>
    Distinct Field Values </usage-examples/distinct>
    Run a Command </usage-examples/command>

source/usage-examples/changestream.txt

@@ -1,9 +1,9 @@
 .. _golang-watch:
 .. _golang-usageex-monitor-changes:
 
-====================
-Monitor Data Changes
-====================
+=================
+Watch for Changes
+=================
 
 .. meta::
    :description: Learn by example: how to monitor data changes in MongoDB by using the {+driver-long+}.