dev-manual: Various fixes for links, typos, and grammar

1. Added "Debian" as a distribution for best results.
2. Fixed a link to the Hob page and two links for the
   Build Appliance.
3. Three typos fixed and a few grammar items fixed.

(From yocto-docs rev: 0b381094ed9cc2d66895d4ad7c63005c8a918eb1)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/dev-manual/dev-manual-start.xml

@@ -53,7 +53,7 @@
             <listitem><para><emphasis>Host System:</emphasis>  You should have a reasonably current
                 Linux-based host system.
                 You will have the best results with a recent release of Fedora,
-                OpenSUSE, Ubuntu, or CentOS as these releases are frequently tested against the Yocto Project
+                OpenSUSE, Debian, Ubuntu, or CentOS as these releases are frequently tested against the Yocto Project
                 and officially supported.
                 For a list of the distributions under validation and their status, see the
                 "<ulink url='&YOCTO_DOCS_REF_URL;#detailed-supported-distros'>Supported Linux Distributions</ulink>" section
@@ -70,7 +70,7 @@
                 for the supported distributions.</para></listitem>
             <listitem id='local-yp-release'><para><emphasis>Yocto Project Release:</emphasis>
                 You need a release of the Yocto Project.
-                You set up a with local <link linkend='source-directory'>Source Directory</link>
+                You set that up with a local <link linkend='source-directory'>Source Directory</link>
                 one of two ways depending on whether you
                 are going to contribute back into the Yocto Project or not.
                 <note>