Update the glossary entry for PACKAGECONFIG in two ways:
1) Explain the recent sixth argument, which identifies conflicting
features for a given feature.
2) Use a different example, as the librsvg "croco" feature no
longer works that way.
(From yocto-docs rev: af9bf61a54c059e72c807ca8061a57d6fe74c5fa)
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>