ref-manual: Add missing whitespace around "=" in a few code examples.

(From yocto-docs rev: 0ed3bd9cfe6a3ad04e2ebbbcc95320275dcfacad)

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

documentation/ref-manual/ref-variables.xml

@@ -7660,10 +7660,9 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     <literallayout class='monospaced'>
      KERNEL_EXTRA_FEATURES ?= "features/netfilter/netfilter.scc features/taskstats/taskstats.scc"
      KERNEL_FEATURES_append = " ${KERNEL_EXTRA_FEATURES}"
-     KERNEL_FEATURES_append_qemuall=" cfg/virtio.scc"
-     KERNEL_FEATURES_append_qemux86=" cfg/sound.scc cfg/paravirt_kvm.scc"
-     KERNEL_FEATURES_append_qemux86-64=" cfg/sound.scc"
-                    </literallayout></para>
+     KERNEL_FEATURES_append_qemuall = " cfg/virtio.scc"
+     KERNEL_FEATURES_append_qemux86 = " cfg/sound.scc cfg/paravirt_kvm.scc"
+     KERNEL_FEATURES_append_qemux86-64 = " cfg/sound.scc"                    </literallayout></para>
             </glossdef>
         </glossentry>
 
@@ -10423,7 +10422,7 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                             <filename>PACKAGECONFIG</filename>.
                             You can either completely override the variable:
                             <literallayout class='monospaced'>
-     PACKAGECONFIG="f4 f5"
+      PACKAGECONFIG = "f4 f5"
                             </literallayout>
                             Or, you can just append the variable:
                             <literallayout class='monospaced'>
@@ -10437,7 +10436,7 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                             As with append files previously described,
                             you can either completely override the variable:
                             <literallayout class='monospaced'>
-     PACKAGECONFIG_pn-<replaceable>recipename</replaceable>="f4 f5"
+     PACKAGECONFIG_pn-<replaceable>recipename</replaceable> = "f4 f5"
                             </literallayout>
                             Or, you can just amend the variable:
                             <literallayout class='monospaced'>