patch 9.0.1025: WinScrolled is not triggered when filler lines change

Problem:    WinScrolled is not triggered when filler lines change.
Solution:   Add "topfill" to the values that WinScrolled triggers on.
            (closes #11668)
diff --git a/runtime/doc/windows.txt b/runtime/doc/windows.txt
index a6cb8b3..924a932 100644
--- a/runtime/doc/windows.txt
+++ b/runtime/doc/windows.txt
@@ -657,9 +657,9 @@
 has changes, using the window ID as the key, and a total count of the changes
 with the key "all".  Example value for |v:event| (|Vim9| syntax):
 	{
-	   all: {width: 0, height: 2, leftcol: 0, topline: 1, skipcol: 0},
-	   1003: {width: 0, height: -1, leftcol: 0, topline: 0, skipcol: 0},
-	   1006: {width: 0, height: 1, leftcol: 0, topline: 1, skipcol: 0},
+	   all: {width: 0, height: 2, leftcol: 0, skipcol: 0, topline: 1, topfill: 0},
+	   1003: {width: 0, height: -1, leftcol: 0, skipcol: 0, topline: 0, topfill: 0},
+	   1006: {width: 0, height: 1, leftcol: 0, skipcol: 0, topline: 1, topfill: 0},
 	}
 
 Note that the "all" entry has the absolute values of the individual windows