[Buildroot] Suggestion for config menu help for path values

[Grant Edwards]

Just a suggestion for anytime somebody is working on the config menu
help for an option that allows a path to be entered: always specify in
the item's help whether an absolute path is required, and if not,
where the starting point is for a relative path.

For several different options, it's taken me many guesses to figure
out from what working direction a relative path should be referenced.
When each guess requires a build from-scratch, you can spend hours
trying to figure out what path value to enter for a particular script
or config file.

Right now I'm trying to figure out the CWD when the post-build script
is called, and I'll submit a help patch when I figure out the answer.

Another source of confusion I've run into a few times are cases where
the title for a config item doesn't match up with either the config
variable name or the phrase commonly used elsewhere to refer to that
item.  For example, it takes a bit if digging to figure out that in
the config menus, what the documentation calls the "post-build
script", who's value is "BR2_ROOTFS_POST_BUILD_SCRIPT" is titled
"Custom script to run before packing files".

A title including the words "post build script" would seem to be a
more obvious/consistent choice.

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