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/version9.txt b/runtime/doc/version9.txt
index cd72d73..606ec79 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -1,4 +1,4 @@
-*version9.txt*  For Vim version 9.1.  Last change: 2025 Jun 16
+*version9.txt*  For Vim version 9.1.  Last change: 2025 Jun 23
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41756,6 +41756,7 @@
 |:pbuffer|		Edit buffer [N] from the buffer list in the preview
 			window
 |:redrawtabpanel|	Force updating the 'tabpanel'.
+|:uniq|			Deduplicate text in the current buffer.
 
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