Merge r409442 from trunk:

* Fix documentation about the data types of attributes in the AJP protocol.

PR: 39658

Submitted by: rpluem


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@533965 13f79535-47bb-0310-9956-ffa450edef68