patch 9.1.0981: tests: typo in test_filetype.vim

Problem:  tests: typo in test_filetype.vim
Solution: fix comment, update lnkmap syntax file and add
          DESCT keyword
          (Wu, Zhenyu)

closes: #16348

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/syntax/lnkmap.vim b/runtime/syntax/lnkmap.vim
index a1d109e..dc097f4 100644
--- a/runtime/syntax/lnkmap.vim
+++ b/runtime/syntax/lnkmap.vim
@@ -2,7 +2,7 @@
 " Language:	TI Linker map
 " Document:	https://downloads.ti.com/docs/esd/SPRUI03A/Content/SPRUI03A_HTML/linker_description.html
 " Maintainer:	Wu, Zhenyu <wuzhenyu@ustc.edu>
-" Last Change:	2024 Dec 25
+" Last Change:	2024 Dec 30
 
 if exists("b:current_syntax")
   finish
@@ -19,7 +19,7 @@
 syn match lnkmapLibFile			'[^ =]\+\.lib\>'
 syn match lnkmapAttrib			'\<[RWIX]\+\>'
 syn match lnkmapAttrib			'\s\zs--HOLE--\ze\%\(\s\|$\)'
-syn keyword lnkmapAttrib		UNINITIALIZED
+syn keyword lnkmapAttrib		UNINITIALIZED DESCT
 
 
 hi def link lnkmapTime			Comment