runtime(systemverilog): use correct matchit pattern for the covergroup block

A covergroup start with the "covergroup" keyword and ends with the
"endgroup" keyword. "group" is not even a reserved keyword in systemverilog.

Reference:
https://www.chipverify.com/systemverilog/systemverilog-covergroup-coverpoint#covergroup
https://github.com/MikePopoloski/slang/blob/master/docs/grammar.md#covergroup_declaration

closes: #19393

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

Author: tarikgraba

runtime/ftplugin/systemverilog.vim

@@ -2,6 +2,7 @@
 " Language:    SystemVerilog
 " Maintainer:  kocha <[email protected]>
 " Last Change: 07-May-2021
+" 2026 Feb 13 by Vim project: correct matchit covergroup block #19394
 
 if exists("b:did_ftplugin")
   finish
@@ -32,7 +33,7 @@ if exists("loaded_matchit")
     \ '\<checker\>:\<endchecker\>,' .
     \ '\<class\>:\<endclass\>,' .
     \ '\<clocking\>:\<endclocking\>,' .
-    \ '\<group\>:\<endgroup\>,' .
+    \ '\<covergroup\>:\<endgroup\>,' .
     \ '\<interface\>:\<endinterface\>,' .
     \ '\<package\>:\<endpackage\>,' .
     \ '\<program\>:\<endprogram\>,' .