ref-manual, dev-manual: Review edits for Build Directory wording.

Did some word-smithing to work around a false statement that
implied externalsrc.bbclass needed to be inherited on a
recipe-by-recipe basis.  This affected the usage section and
the glossary definitions for both EXTERNALSRC and EXTERNALSRC_BUILD.

Also updated the "B" variable description to be more accurate
in the use of the term "Build Directory."

(From yocto-docs rev: 46695817b6e44cfa88161699105b8d03a5828fd2)

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

0 files changed, 0 insertions, 0 deletions