Add tutor entry about 2-character label jump (#11273)

* Add tutor entry about 2-character label jump

* Move gw tutor to chapter 9

* Do not explicitely say which labels are shown following gw

runtime/tutor

@@ -988,6 +988,28 @@ lines.
 
 
 
+=================================================================
+=             9.4 JUMP WITH TWO-CHARACTER LABELS                =
+=================================================================
+
+ Type gw to enable the 2-character labels. The start of each word
+ will be replaced by 2 highlighted characters. Type any sequence
+ of 2 highlighted characters to jump to the corresponding label,
+ or use ESC to drop the labels.
+
+ The 2-character labels allow to quickly jump to any location
+ in the viewable selection.
+
+ 1. Move the cursor to the start of the line marked '-->' below.
+ 2. Press gw to enable the 2-character labels, and then the two
+    characters that replace the two leters he at the start of
+    here to jump to the corresponding word.
+
+ --> This is just a simple line of text.
+     There may be many such lines
+     But you really want to jump here!
+     This is fast with the 2-character labels.
+
 =================================================================
 =                        CHAPTER 9 RECAP                        =
 =================================================================
@@ -1001,8 +1023,8 @@ lines.
    * Press Ctrl-i and Ctrl-o to go forward and backward in the
      jumplist.
 
-
+ * Type gw to enable 2-characters labels, and any 2 characters
-
+   to jump to the corresponding label, or ESC to drop the labels.