doc: expand on the meson build instructions

https://bugs.freedesktop.org/show_bug.cgi?id=101686

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit 7b98f8e)

doc/building.dox

@@ -26,15 +26,29 @@ $> sudo ninja -C builddir/ install
 $> sudo udevadm hwdb --update
 @endcode
 
-The ```prefix``` option or other options can be changed later with the
-```mesonconf``` command.
+Additional options may also be specified. For example:
+@code
+$> meson --prefix=/usr -Ddocumentation=false -Dlibwacom=false builddir/
+@endcode
 
+The ```prefix``` or other options can be changed later with the
+```mesonconf``` command. For example:
 @code
-$> mesonconf builddir/ -Dprefix=/some/other/prefix
+$> mesonconf builddir/ -Dprefix=/some/other/prefix -Ddocumentation=true
 $> ninja -C builddir
 $> sudo ninja -C builddir/ install
 @endcode
 
+Running ``mesonconf builddir/`` with no other arguments lists all
+configurable options meson provides.
+
+To rebuild from scratch, simply remove the build directory and run meson
+again:
+@code
+$> rm -r builddir/
+$> meson --prefix=....
+@endcode
+
 @subsection building_autotools Building with automake
 
 libinput currently also provides the autotools build system, but this will