runtime(doc): Tweak documentation style a bit

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/vim9.txt b/runtime/doc/vim9.txt
index 54fb8f3..ba72358 100644
--- a/runtime/doc/vim9.txt
+++ b/runtime/doc/vim9.txt
@@ -1,4 +1,4 @@
-*vim9.txt*	For Vim version 9.1.  Last change: 2025 Apr 03
+*vim9.txt*	For Vim version 9.1.  Last change: 2025 Apr 18
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -1493,11 +1493,11 @@
 tuple<number, string>		a tuple with two items of type |Number| and
 				|String|
 tuple<number, float, bool>	a tuple with three items of type |Number|,
-				|Float| and |Boolean|.
+				|Float| and |Boolean|
 tuple<...list<number>>		a variadic tuple with zero or more items of
-				type |Number|.
+				type |Number|
 tuple<number, ...list<string>>	a tuple with an item of type |Number| followed
-				by zero or more items of type |String|.
+				by zero or more items of type |String|
 
 Examples: >
     var myTuple: tuple<number> = (20,)