Fix spelling of ARM Cortex

It's Cortex-Xn, not Cortex Xn or cortex xn or cortex-xn or CORTEX-Xn
or CortexXn. Further it's Cortex-M0+, not M0plus.

Cf. http://www.arm.com/products/processors/index.php

Consistently write it the official way, so that it stops propagating.
Originally spotted in the documentation, it mainly affects code comments
but also Atmel SAM3/SAM4/SAMV, NiietCM4 and SiM3x flash driver output.

Found via:

  git grep -i "Cortex "
  git grep -i "Cortex-" | grep -v "Cortex-" | grep -v ".cpu"
  git grep -i "CortexM"

Change-Id: Ic7b6ca85253e027f6f0f751c628d1a2a391fe914
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-on: http://openocd.zylin.com/3483
Tested-by: jenkins
Reviewed-by: Marc Schink <openocd-dev@marcschink.de>
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

src/rtos/mqx.c

@@ -109,7 +109,7 @@ static int mqx_valid_address_check(
 	enum mqx_arch arch_type = ((struct mqx_params *)rtos->rtos_specific_params)->target_arch;
 	const char * targetname = ((struct mqx_params *)rtos->rtos_specific_params)->target_name;
 
-	/* Cortex M address range */
+	/* Cortex-M address range */
 	if (arch_type == mqx_arch_cortexm) {
 		if (
 			/* code and sram area */