arch/arm/core: In comments, consistently refer to "Cortex-M".

This directory now handles all of Cortex-M0, Cortex-M3/M4. So, just
consistently use "Cortex-M" (as used by number of files already)
without refering to a particular subarch. Also, consistently (letter
casing) spell it as "Cortex-M". A typo is fixed too.

Change-Id: I42ee09abc9a503381bca4ae437c83a8f48816ebc
Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>

arch/arm/core/cortex_m/scb.c

@@ -6,7 +6,7 @@
 
 /**
  * @file
- * @brief ARM CORTEX-M3 System Control Block interface
+ * @brief ARM Cortex-M System Control Block interface
  *
  *
  * Most of the SCB interface consists of simple bit-flipping methods, and is

arch/arm/core/cpu_idle.S

@@ -6,7 +6,7 @@
 
 /**
  * @file
- * @brief ARM CORTEX-M3 power management
+ * @brief ARM Cortex-M power management
  *
  */
 
@@ -100,7 +100,7 @@ SECTION_FUNC(TEXT, _NanoIdleValClear)
  *
  * @brief Power save idle routine for ARM Cortex-M
  *
- * This function will be called by the ernel idle loop or possibly within
+ * This function will be called by the kernel idle loop or possibly within
  * an implementation of _sys_power_save_idle in the kernel when the
  * '_sys_power_save_flag' variable is non-zero.  The ARM 'wfi' instruction
  * will be issued, causing a low-power consumption sleep mode.

arch/arm/core/exc_exit.S

@@ -6,7 +6,7 @@
 
 /**
  * @file
- * @brief ARM CORTEX-M exception/interrupt exit API
+ * @brief ARM Cortex-M exception/interrupt exit API
  *
  *
  * Provides functions for performing kernel handling when exiting exceptions or

arch/arm/core/irq_manage.c

@@ -6,7 +6,7 @@
 
 /**
  * @file
- * @brief ARM CORTEX-M3 interrupt management
+ * @brief ARM Cortex-M interrupt management
  *
  *
  * Interrupt management: enabling/disabling and dynamic ISR

arch/arm/core/isr_wrapper.S

@@ -6,7 +6,7 @@
 
 /**
  * @file
- * @brief ARM CORTEX-M3 wrapper for ISRs with parameter
+ * @brief ARM Cortex-M wrapper for ISRs with parameter
  *
  * Wrapper installed in vector table for handling dynamic interrupts that accept
  * a parameter.

arch/arm/core/swap.S

@@ -9,7 +9,7 @@
  * @brief Thread context switching for ARM Cortex-M
  *
  * This module implements the routines necessary for thread context switching
- * on ARM Cortex-M3/M4 CPUs.
+ * on ARM Cortex-M CPUs.
  */
 
 #include <kernel_structs.h>