patch 9.1.1065: no digraph for "Approaches the limit"

Problem:  no digraph for "Approaches the limit"
Solution: Add the digraph using .= (Hans Ginzel)

Add digraph Approaches the Limit

≐ U+2250 https://www.fileformat.info/info/unicode/char/2250/index.htm

closes: #16508

Signed-off-by: Hans Ginzel <hans@matfyz.cz>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index 64f49a6..010a0cb 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -41635,6 +41635,7 @@
 	"preinsert"	- highlight to be inserted values
 - add |dist#vim9#Launch()| and |dist#vim9#Open()| to the |vim-script-library|
   and decouple it from |netrw|
+- new digraph "APPROACHES THE LIMIT" using ".="
 
 							*added-9.2*
 Added ~