Fix typos (#473)

diff --git a/org.jacoco.doc/docroot/doc/agent.html b/org.jacoco.doc/docroot/doc/agent.html
index 6b428af..59f0cdd 100644
--- a/org.jacoco.doc/docroot/doc/agent.html
+++ b/org.jacoco.doc/docroot/doc/agent.html
@@ -33,7 +33,7 @@
 
 <p>
   The JaCoCo agent collects execution information and dumps it on request or
-  when the JVM exits. There are three different modes for execution data ouput:
+  when the JVM exits. There are three different modes for execution data output:
 </p>
 
 <ul>