dev-manual: Updates to the "Writing a New Recipe" section.

Made several improvements to this section.

 * fixed a typo where a YP release was referred to as 7.1
   instead of 1.7

 * Added a note box to the "Using Variables" list item
   elaborating on the expansion behavior.

 * Removed the detail around the WORKDIR discussion.

 * In the "Loccate or Automatically Create a Base Recipe",
   I added the devtool add method to the list of ways to
   create a base recipe.

(From yocto-docs rev: 79c86fc3653c747ae42f08528063a8984cdd3b4d)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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