Since commit 24772dd2ae6c ("parse/ConfHandler: Add warning for
deprecated whitespace usage") in BitBake, a warning is printed when
there are no spaces around an `=` assignment.
Adjust the documentation to show good examples only.
(From yocto-docs rev: 77ce1544dd793036b1135817c02e090138fe6407)
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>