bitbake: usermanual.xml: Two new sections added to BitBake "Description"
1. Added a new section "Appending and Prepending (override style
syntax)". This section shows how the append and prepend operators
work using the override style syntax.
2. Added a new section "Removing (override style syntax)". This
section describes the new "_remove" operator.
(Bitbake rev:
6983afab0ce8d82d102142636d5a570f7d86a844)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>