patch 9.0.0280: the builtin termcap list depends on the version

Problem:    The builtin termcap list depends on the version.
Solution:   Always include all termcap entries.  Remove duplicate lines.
diff --git a/runtime/doc/various.txt b/runtime/doc/various.txt
index 1ba5e04..fd2dcf0 100644
--- a/runtime/doc/various.txt
+++ b/runtime/doc/various.txt
@@ -342,8 +342,8 @@
 H  *+balloon_eval_term*	|balloon-eval| support in the terminal,
 			'balloonevalterm'
 N  *+browse*		|:browse| command
-N  *+builtin_terms*	some terminals builtin |builtin-terms|
-B  *++builtin_terms*	maximal terminals builtin |builtin-terms|
+T  *++builtin_terms*	maximal terminals builtin |builtin-terms| Always
+			enabled since 9.0.0280
 N  *+byte_offset*	support for 'o' flag in 'statusline' option, "go"
 			and ":goto" commands.
 m  *+channel*		inter process communication |channel|