patch 8.1.1901: the +insert_expand feature is not always available

Problem:    The +insert_expand feature is not always available.
Solution:   Graduate the +insert_expand feature.
diff --git a/runtime/doc/change.txt b/runtime/doc/change.txt
index 4c87726..dc9acca 100644
--- a/runtime/doc/change.txt
+++ b/runtime/doc/change.txt
@@ -691,10 +691,8 @@
 	    <Esc>   to quit substituting
 	    'a'	    to substitute this and all remaining matches
 	    'q'	    to quit substituting
-	    CTRL-E  to scroll the screen up {not available when compiled
-		       without the |+insert_expand| feature}
-	    CTRL-Y  to scroll the screen down {not available when compiled
-		       without the |+insert_expand| feature}
+	    CTRL-E  to scroll the screen up
+	    CTRL-Y  to scroll the screen down
 	If the 'edcompatible' option is on, Vim remembers the [c] flag and
 	toggles it each time you use it, but resets it when you give a new
 	search pattern.