patch 9.1.1408: not easily possible to complete from register content

Problem:  not easily possible to complete from register content
Solution: add register-completion submode using i_CTRL-X_CTRL-R
          (glepnir)

closes: #17354

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index e03deed..662cb17 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 May 16
+*version9.txt*  For Vim version 9.1.  Last change: 2025 May 26
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41586,6 +41586,9 @@
 
 Support for a vertical |tabpanel| window similar to the 'tabline'.
 
+New Insert-mode completion: |i_CTRL-X_CTRL-R| to complete words from
+registers.
+
 							*changed-9.2*
 Changed~
 -------