Add documentation for fastcgi_finish_request() (and add an FPM book as a
whole).

This is the first part of a rainy day task to try to clean up some of our build
warnings.


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331257 c90b9560-bf6c-de11-be94-00142212c4b1
"md5" and friends aren't functions in this context, and the missing sha256()
and sha512() functions generate build warnings.


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331258 c90b9560-bf6c-de11-be94-00142212c4b1
Fix incorrect function element.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331259 c90b9560-bf6c-de11-be94-00142212c4b1