poky.ent: Removed the ENTITY for the concepts-manual.

Removed the YOCTO_DOCS_CM_URL from the mix of things.  The manual
will not exist.

(From yocto-docs rev: d97df11478566654d95f02b6fe61eaa0068afb5f)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/poky.ent

@@ -64,7 +64,6 @@
 <!ENTITY YOCTO_DOCS_SDK_URL "&YOCTO_DOCS_URL;/&YOCTO_DOC_VERSION;/sdk-manual/sdk-manual.html">
 <!ENTITY YOCTO_DOCS_OVERVIEW_URL "&YOCTO_DOCS_URL;/&YOCTO_DOC_VERSION;/overview-manual/overview-manual.html">
 <!ENTITY YOCTO_DOCS_GS_URL "&YOCTO_DOCS_URL;/&YOCTO_DOC_VERSION;/getting-started/getting-started.html">
-<!ENTITY YOCTO_DOCS_CM_URL "&YOCTO_DOCS_URL;/&YOCTO_DOC_VERSION;/concepts-manual/concepts-manual.html">
 <!ENTITY YOCTO_DOCS_BRIEF_URL "&YOCTO_DOCS_URL;/&YOCTO_DOC_VERSION;/brief-yoctoprojectqs/brief-yoctoprojectqs.html">
 <!ENTITY YOCTO_ADTPATH_DIR "/opt/poky/&DISTRO;">
 <!ENTITY YOCTO_POKY_TARBALL "&YOCTO_POKY;.tar.bz2">