documenation: dev-manual - Updates to dev shell section

Fixes [YOCTO #2909]

Applied a few changes based on Paul Eggleton's review
of the section.

(From yocto-docs rev: 54c2b1577ba062e09a8df14767257147e33a939f)

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

documentation/dev-manual/dev-manual-model.xml

@@ -1877,8 +1877,8 @@ directory.</para></listitem>
     </para>
 
     <para>
-        Within this environment, you can run <filename>configure</filename>
-        or <filename>compile</filename> commands as if they were being run by 
+        Within this environment, you can run configure or compile
+        commands as if they were being run by 
         the OpenEmbedded build system itself.
         As noted earlier, the working directory also automatically changes to the 
         Source Directory (<ulink url='&YOCTO_DOCS_REF_URL;#var-S'><filename>S</filename></ulink>).
@@ -1888,12 +1888,6 @@ directory.</para></listitem>
         When you are finished, you just exit the shell or close the terminal window.
     </para>
 
-    <para>
-        Because an external shell is launched rather than opening directly into the 
-        original terminal window, it allows easier interaction with BitBake's multiple
-        threads as well as accomodates a future client/server split.
-    </para>
-
     <note>
         <para>
             It is worth remembering that when using <filename>devshell</filename>