fix: assembly highlight

Author: minerva-wow

_posts/2021-11-20-startup-stm32.md

@@ -13,7 +13,7 @@ Imagine your STM32F103VE as a person waking up in the morning. Just like how we
 
 ### First Things First: Getting Oriented
 
-```assembly
+```asm
 Stack_Size      EQU     0x00000400    ; Like choosing how much space you need
                                       ; 1KB of stack - your working space
 
@@ -31,7 +31,7 @@ Just as you need to know where your things are when you wake up, the MCU needs t
 
 ## The Morning Checklist (Vector Table)
 
-```assembly
+```asm
                 AREA    RESET, DATA, READONLY
                 EXPORT  __Vectors
                 
@@ -45,7 +45,7 @@ Think of this as your morning emergency contacts list - who to call when differe
 
 ## The Wake-up Routine (Reset_Handler)
 
-```assembly
+```asm
 Reset_Handler   PROC
                 EXPORT  Reset_Handler             [WEAK]
                 IMPORT  __main
@@ -68,7 +68,7 @@ This is like your morning routine - get up (SystemInit), get ready, and start yo
 ### Quick Start Mode
 For when you need to get going fast:
 
-```assembly
+```asm
 ; Like grabbing a quick breakfast
 Reset_Handler   PROC
                 CPSID   I               ; Do Not Disturb mode
@@ -82,7 +82,7 @@ Reset_Handler   PROC
 ### Safety Check Mode
 When you need extra security:
 
-```assembly
+```asm
 ; Like double-checking everything before leaving
                 LDR     R0, =SafetyCheck
                 BLX     R0