documentation: Updated release date scheme to use variable.

The release date is moving on Pyro.  Added a new variable that I
set to "May 2018" for the release date.  This way if it pushes past
May, I just need to update poky.ent.

(From yocto-docs rev: 928c6a2bf1c31e3819ec33e09bec6c69e2ccea76)

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

documentation/bsp-guide/bsp-guide.xml

@@ -135,7 +135,7 @@
             </revision>
             <revision>
                 <revnumber>2.3.4</revnumber>
-                <date>April 2018</date>
+                <date>&REL_MONTH_YEAR;</date>
                 <revremark>Released with the Yocto Project 2.3.4 Release.</revremark>
             </revision>
         </revhistory>

documentation/dev-manual/dev-manual.xml

@@ -113,7 +113,7 @@
             </revision>
             <revision>
                 <revnumber>2.3.4</revnumber>
-                <date>April 2018</date>
+                <date>&REL_MONTH_YEAR;</date>
                 <revremark>Released with the Yocto Project 2.3.4 Release.</revremark>
             </revision>
         </revhistory>

documentation/kernel-dev/kernel-dev.xml

@@ -98,7 +98,7 @@
             </revision>
             <revision>
                 <revnumber>2.3.4</revnumber>
-                <date>April 2018</date>
+                <date>&REL_MONTH_YEAR;</date>
                 <revremark>Released with the Yocto Project 2.3.4 Release.</revremark>
             </revision>
         </revhistory>

documentation/mega-manual/mega-manual.xml

@@ -82,7 +82,7 @@
             </revision>
             <revision>
                 <revnumber>2.3.4</revnumber>
-                <date>April 2018</date>
+                <date>&REL_MONTH_YEAR;</date>
                 <revremark>Released with the Yocto Project 2.3.4 Release.</revremark>
             </revision>
        </revhistory>

documentation/poky.ent

@@ -3,6 +3,7 @@
 <!ENTITY DISTRO_NAME_NO_CAP "pyro">
 <!ENTITY DISTRO_NAME "Pyro">
 <!ENTITY YOCTO_DOC_VERSION "2.3.4">
+<!ENTITY REL_MONTH_YEAR "May 2018">
 <!ENTITY POKYVERSION "18.0.4">
 <!ENTITY POKYVERSION_COMPRESSED "1804">
 <!ENTITY YOCTO_POKY "poky-&DISTRO_NAME_NO_CAP;-&POKYVERSION;">

documentation/profile-manual/profile-manual.xml

@@ -98,7 +98,7 @@
             </revision>
             <revision>
                 <revnumber>2.3.4</revnumber>
-                <date>April 2018</date>
+                <date>&REL_MONTH_YEAR;</date>
                 <revremark>Released with the Yocto Project 2.3.4 Release.</revremark>
             </revision>
         </revhistory>

documentation/ref-manual/ref-manual.xml

@@ -129,7 +129,7 @@
             </revision>
             <revision>
                 <revnumber>2.3.4</revnumber>
-                <date>April 2018</date>
+                <date>&REL_MONTH_YEAR;</date>
                 <revremark>Released with the Yocto Project 2.3.4 Release.</revremark>
             </revision>
         </revhistory>

documentation/sdk-manual/sdk-manual.xml

@@ -63,7 +63,7 @@
             </revision>
             <revision>
                 <revnumber>2.3.4</revnumber>
-                <date>April 2018</date>
+                <date>&REL_MONTH_YEAR;</date>
                 <revremark>Released with the Yocto Project 2.3.4 Release.</revremark>
             </revision>
        </revhistory>

documentation/toaster-manual/toaster-manual.xml

@@ -73,7 +73,7 @@
             </revision>
             <revision>
                 <revnumber>2.3.4</revnumber>
-                <date>April 2018</date>
+                <date>&REL_MONTH_YEAR;</date>
                 <revremark>Released with the Yocto Project 2.3.4 Release.</revremark>
             </revision>
        </revhistory>