ref-manual: Removed redundant "and"

(From yocto-docs rev: 60a1b98e22d4118e090c0dd214736b78884da227)

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

documentation/ref-manual/ref-variables.xml

@@ -12388,7 +12388,7 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     Using terminology from GNU, the primary system is referred
                     to as the "HOST" and the secondary, or different, system is
                     referred to as the "TARGET".
-                    Thus, the binaries run on the "HOST" system and
+                    Thus, the binaries run on the "HOST" system
                     and generate binaries for the "TARGET" system.
                     The <filename>STAGING_DIR_HOST</filename> variable points
                     to the sysroot used for the "HOST" system, while