adt-manual: Added some reasoning behind sourcing the xtoolchain env script

The intro to the "installing the ADT and Toolchains" section notes
that the user must source the cross-toolchain environment setup
script.  I added a clause stating that this establishes environment
variables.

Fixes [YOCTO #7133] partially.

(From yocto-docs rev: e9777012d935ced8fd82209543569aaa70ab1832)

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

1 files changed, 7 insertions, 5 deletions

diff --git a/documentation/adt-manual/adt-prepare.xml b/documentation/adt-manual/adt-prepare.xml
index 3810568730..b69586f13e 100644
--- a/documentation/adt-manual/adt-prepare.xml
+++ b/documentation/adt-manual/adt-prepare.xml
@@ -17,13 +17,15 @@
     <title>Installing the ADT and Toolchains</title>
 
     <para>
-        The following list describes installation methods that set up varying degrees of tool
-        availability on your system.
+        The following list describes installation methods that set up varying
+        degrees of tool availability on your system.
         Regardless of the installation method you choose,
         you must <filename>source</filename> the cross-toolchain
-        environment setup script before you use a toolchain.
-        See the "<link linkend='setting-up-the-cross-development-environment'>Setting Up the
-        Cross-Development Environment</link>" section for more information.
+        environment setup script, which establishes several key
+        environment variables, before you use a toolchain.
+        See the
+        "<link linkend='setting-up-the-cross-development-environment'>Setting Up the Cross-Development Environment</link>"
+        section for more information.
     </para>
 
     <note>