runtime(doc): add missing usr_52 entry to toc

fixes: #15821

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/usr_toc.txt b/runtime/doc/usr_toc.txt
index 3da7698..22f71e0 100644
--- a/runtime/doc/usr_toc.txt
+++ b/runtime/doc/usr_toc.txt
@@ -1,4 +1,4 @@
-*usr_toc.txt*	For Vim version 9.1.  Last change: 2024 Oct 05
+*usr_toc.txt*	For Vim version 9.1.  Last change: 2024 Oct 07
 
 		     VIM USER MANUAL - by Bram Moolenaar
 
@@ -360,6 +360,7 @@
 		|52.3|	Autoloading without import/export
 		|52.4|	Other mechanisms to use
 		|52.5|	Using a Vim9 script from legacy script
+		|52.6|	Vim9 examples: comment and highlight-yank plugin
 
 ==============================================================================
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