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/FreeRTOS.c

@@ -430,7 +430,7 @@ static int FreeRTOS_get_thread_reg_list(struct rtos *rtos, int64_t thread_id, ch
 										thread_id + param->thread_stack_offset,
 										stack_ptr);
 
-	/* Check for armv7m with *enabled* FPU, i.e. a Cortex M4F */
+	/* Check for armv7m with *enabled* FPU, i.e. a Cortex-M4F */
 	int cm4_fpu_enabled = 0;
 	struct armv7m_common *armv7m_target = target_to_armv7m(rtos->target);
 	if (is_armv7m(armv7m_target)) {