bitbake-user-manual-metadata.xml: fix a minor error
In the '_remove' example in bitbake-user-manual-metadata.xml, there is
no 'jkl' in the original value of FOO2. So remove it from result.
Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>