runtime(config): fix inconsistent group name

related: #18292

Signed-off-by: zeertzjq <[email protected]>
Signed-off-by: Christian Brabandt <[email protected]>

Author: zeertzjq

runtime/syntax/config.vim

@@ -6,6 +6,7 @@
 " 				(patch from Khym Chanur to add @Spell)
 " 				(patch from James McCoy to fix paren matching)
 " 				(2025 Sep 14 patch from Damien Lejay to detect unportable +=)
+" 				(2025 Sep 18 by Vim Project: fix inconsistent group name)
 
 " Well, I actually even do not know much about m4. This explains why there
 " is probably very much missing here, yet !
@@ -36,7 +37,7 @@ syn region  configmsg matchgroup=configfunction start="AC_MSG_[A-Z]*\ze(\[" matc
 syn region  configmsg matchgroup=configfunction start="AC_MSG_[A-Z]*\ze([^[]" matchgroup=configdelimiter end=")" contains=configdelimiter,@Spell
 
 " Help write portable shell code
-syn match acPlusEq '\v\+\=' containedin=ALLBUT,configcomment
+syn match configPlusEq '\v\+\=' containedin=ALLBUT,configcomment
 
 " Define the default highlighting.
 " Only when an item doesn't have highlighting yet
@@ -51,7 +52,7 @@ hi def link configkeyword   Keyword
 hi def link configspecial   Special
 hi def link configstring    String
 hi def link configmsg       String
-hi def link acPlusEq        Error
+hi def link configPlusEq    Error
 
 
 let b:current_syntax = "config"