dev-manual: minor grammatical tweaks to chapter 4

index eb24643..a3852c4 100644
@@ -70,7 +70,7 @@
         <title>Developing a Board Support Package (BSP)</title>
 
         <para>
-            A BSP is a package of recipes that, when applied during a build, results in
+            A BSP is a collection of recipes that, when applied during a build, results in
             an image that you can run on a particular board.
             Thus, the package when compiled into the new image, supports the operation of the board.
         </para>

@@ -156,8 +156,9 @@
                     Yocto Project Board Support Package (BSP) Developer's Guide.</para>
                     <note>Five BSPs exist that are part of the
                     Yocto Project release: <filename>genericx86</filename>, <filename>genericx86-64</filename>,
-                    <filename>beaglebone</filename>,
-                    <filename>mpc8315e</filename>, and <filename>edgerouter</filename>.
+                    <filename>beaglebone</filename> (ARM),
+                    <filename>mpc8315e</filename> (PowerPC),
+                    and <filename>edgerouter</filename> (MIPS).
                     The recipes and configurations for these five BSPs are located and dispersed
                     within the <link linkend='source-directory'>Source Directory</link>.
                     On the other hand, BSP layers for Crown Bay,

@@ -310,7 +311,7 @@
                 kernel.
                 Thus, everything further to the right in the structure is based on the
                 <filename>linux-yocto-3.4</filename> kernel.
-                Branch points to right in the figure represent where the
+                Branch points to the right in the figure represent where the
                 <filename>linux-yocto-3.4</filename> kernel is modified for specific hardware
                 or types of kernels, such as real-time kernels.
                 Each leaf thus represents the end-point for a kernel designed to run on a specific