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/jtag/drivers/openjtag.c

@@ -32,7 +32,7 @@
  ***************************************************************************/
 
 /***************************************************************************
- * Version 1.0  Tested on a MCBSTM32 board using a Cortex M3 (stm32f103x), *
+ * Version 1.0  Tested on a MCBSTM32 board using a Cortex-M3 (stm32f103x), *
  *              GDB and Eclipse under Linux (Ubuntu 10.04)                 *
  *                                                                         *
  ***************************************************************************/

src/jtag/drivers/stlink_usb.c

@@ -1164,7 +1164,7 @@ static int stlink_usb_step(void *handle)
 
 	if (h->jtag_api == STLINK_JTAG_API_V2) {
 		/* TODO: this emulates the v1 api, it should really use a similar auto mask isr
-		 * that the cortex-m3 currently does. */
+		 * that the Cortex-M3 currently does. */
 		stlink_usb_write_debug_reg(handle, DCB_DHCSR, DBGKEY|C_HALT|C_MASKINTS|C_DEBUGEN);
 		stlink_usb_write_debug_reg(handle, DCB_DHCSR, DBGKEY|C_STEP|C_MASKINTS|C_DEBUGEN);
 		return stlink_usb_write_debug_reg(handle, DCB_DHCSR, DBGKEY|C_HALT|C_DEBUGEN);