patch 9.1.1476: no easy way to deduplicate text

Problem:  no easy way to deduplicate text
Solution: add the :uniq ex command
          (Hirohito Higashi)

closes: #17538

Signed-off-by: Hirohito Higashi <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 8c79f56..8bd914b 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2025 Jun 07
+*builtin.txt*	For Vim version 9.1.  Last change: 2025 Jun 23
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -12143,6 +12143,7 @@
 			:let newlist = uniq(copy(mylist))
 <		The default compare function uses the string representation of
 		each item.  For the use of {func} and {dict} see |sort()|.
+		For deduplicating text in the current buffer see |:uniq|.
 
 		Returns zero if {list} is not a |List|.