doc: minor wording improvement to the diagnostics guide

Change-Id: I7ca964a8bce1f7a990c25f61035ffbecb8548fcd

Author: rakyll

doc/diagnostics.html

@@ -222,7 +222,7 @@ <h2 id="tracing">Tracing</h2>
 <p>Tracing enables us to:</p>
 
 <ul>
-<li>Instrument and profile application latency in a Go process.</li>
+<li>Instrument and analyze application latency in a Go process.</li>
 <li>Measure the cost of specific calls in a long chain of calls.</li>
 <li>Figure out the utilization and performance improvements.
 Bottlenecks are not always obvious without tracing data.</li>