dev-manual: Mention wildcard bbappends, grammar fix.

index 434a7d1..0f7708e 100644
@@ -511,6 +511,10 @@
                 <para>Information in append files overrides the information in the similarly-named recipe file.
                 For an example of an append file in use, see the
                 "<link linkend='using-bbappend-files'>Using .bbappend Files</link>" section.
+                <note>
+                    Append files can also use wildcard patterns in their version numbers
+                    so they can be applied to more than one version of the underlying recipe file.
+                </note>
                 </para></listitem>
             <listitem><para id='bitbake-term'><emphasis>BitBake:</emphasis>
                 The task executor and scheduler used by the OpenEmbedded build

@@ -686,7 +690,7 @@
                 This Metadata is found in the <filename>meta</filename> directory of the
                 <link linkend='source-directory'>Source Directory</link>.</para></listitem>
             <listitem><para><emphasis>Package:</emphasis>
-                In the context of the Yocto Project, this term refers a
+                In the context of the Yocto Project, this term refers to a
                 recipe's packaged output produced by BitBake (i.e. a
                 "baked recipe").
                 A package is generally the compiled binaries produced from the