Corrected the context and added the corresponding override information.

Corrected default values.
Corrected the ISPAIFileChache/ISAPIFileCache directive. The correct name
  is ISAPICacheFile.
Added description for the ISAPIFakeAsync directive.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96535 13f79535-47bb-0310-9956-ffa450edef68