Removing obsolete selinux setup

[Pete Stieber]

I have a machine that has dokuwiki loaded.  In order to get it to work 
with selinux, I followed some advice that was on:

https://www.dokuwiki.org/install:fedora

to allow apache to edit some files:

semanage fcontext -a -t httpd_mediawiki_rw_content_t '/etc/dokuwiki'
restorecon -v '/etc/dokuwiki'
semanage fcontext -a -t httpd_mediawiki_rw_content_t 
'/etc/dokuwiki/users.auth.php'
restorecon -v '/etc/dokuwiki/users.auth.php'
semanage fcontext -a -t httpd_mediawiki_rw_content_t 
'/etc/dokuwiki/local.php'
restorecon -v '/etc/dokuwiki/local.php'

This worked on 19 and 20, but when I upgraded the machine to Fedora 21 
and the httpd_mediawiki_rw_content_t no longer exists.  I tried

semanage fcontext -d -t httpd_mediawiki_rw_content_t '/etc/dokuwiki'

but I get complaints about the media wiki context being invalid.

How do I remove these obsolete entries from the selinux database?

Pete