Avoid stacktrace in logs if the session closes due to an IO error in the middle of sending a partial message.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1530881 13f79535-47bb-0310-9956-ffa450edef68
Merged revision 1530875 from tomcat/trunk:
The link under Tomcat Context Descriptor section should point to documentation about context.xml and not the one for server.xml. Issue is reported via o.a.comments.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1530884 13f79535-47bb-0310-9956-ffa450edef68