Documentation: Capitalize RAM, ROM and ACPI

Change-Id: I06c1d0fe0e3d429e54d3777de679f9fc641f4eed
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/15927
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

Documentation/RFC/config.tex

@@ -172,7 +172,7 @@ A sample file:
 \begin{verbatim}
 target x
 
-# over-ride the default rom size in the mainboard file
+# over-ride the default ROM size in the mainboard file
 option CONFIG_ROM_SIZE=1024*1024
 mainboard amd/solo
 end