correct micro arm assembly highlighting

arm.yaml

# ARM assembly language

filetype: arm_asm

detect:
    filename: "\\.(S)$"
    
rules:
    ## Instructions
    # Load/store instructions
    - statement: "\\b(?i)(ldc|ldm|ldr|ldrb|ldrh|stc|stm|str|strb|strh)(?-i)\\b"
    # Branch instructions
    - statement: "\\b(?i)(b|bl|bx|beq|bne|bcs|bcc|bmi|bpl|bvs|bvc|bhi|bls|bge|blt|bgt|ble)(?-i)\\b"
    # Pseudo instructions
    - statement: "\\b(?i)(push|pop)(?-i)\\b"
    # Shift and rotate
    - statement: "\\b(?i)(asl|asr|lsl|lsr|rol|ror)(?-i)\\b"
    # Everything else
    - statement: "\\b(?i)(adr|adc|add|and|bic|cdp|cmn|cmp|eor|mcr|mla|mov|mrc|mrs|mul|mvn|orr|rsb|rsc|sbc|sub|swi|swp|teq|tst)(?-i)\\b"

    # Label
    - special: ".*:"
    
    ## Registers
    - identifier: "\\b(?i)(r[0-9]|r1[012345]|[fis]p|lr|pc|cpsr)(?-i)\\b"

    ## Constant numbers
    # In immediates, with leading #
    - constant.number: "#(0b[0-1]+|0x[0-9a-fA-F]+|[0-9]+)\\b" 
    # In directives, without leading #
    - constant.number: "\\b([0-9]+|0x[0-9a-fA-F]+)\\b"

    ## Constant strings
    # Strings, using double quotes
    - constant.string:
        start: "\""
        end: "\""
        skip: "\\\\."
        rules:
            - constant.specialChar: "\\\\."
    # Characters, using single quotes
    - constant.string:
        start: "\'"
        end: "\'"
        skip: "\\\\."
        rules:
            - constant.specialChar: "\\\\."

    # Directives. Sorta preprocessor
    - preproc: "(\\.align|\\.balign|\\.data|\\.equ|\\.end|\\.extern|\\.func|\\.global|\\.section|\\.skip|\\.text|#include|#define|#ifdef|#ifndef|#endif|#error)"
    
    # Data storage. Sorta types
    - type: "(\\.ascii|\\.asciz|\\.byte|\\.hword|\\.word|\\.long)"

    - comment:
        start: "//"
        end: "$"
        rules:
            - todo: "(TODO|XXX|FIXME):?"

    - comment:
        start: "/\\*"
        end: "\\*/"
        rules:
            - todo: "(TODO|XXX|FIXME):?"