add some details about wire placement

doc/xschem_man/commands.html

@@ -336,6 +336,12 @@ set replace_key(w) Shift-W
  <p> Pressing <kbd>Shift-m</kbd> instead of <kbd>m</kbd> will create new wires while moving the selected objects.</p>
  <img src="commands10.png">
 
+ <h3>PLACE, WIRES MANHATTAN PATHS</h3>
+ <p> When you press the <kbd>w</kbd> key a wire placement begins. Moving the mouse a rubber wire is displayed.
+  Clicking the left mouse button will end the wire placement. If the space bar is pressed you toggle between
+  Horizontal-Vertical, Vertical-Horizontal and oblique placement mode.<p>
+ <img src="commands14.png">
+
  <h3>PLACE WIRES SNAPPING TO CLOSEST PIN OT NET ENDPOINT</h3>
  <p>
   The (uppercase) <kbd>'W'</kbd> bindkey allows to place a wire putting start (and end point, later) to the 
@@ -355,7 +361,7 @@ set replace_key(w) Shift-W
  <p style="padding-top:0px;"> <i>
   Unconstrained move: objects follow the mouse pointer in X and Y direction.
  </i></p>
- <h3>POLYGON EDITINC COMMANDS</h3>
+ <h3>POLYGON EDITING COMMANDS</h3>
  <p> There are some specific editing modes for polygons. A polygon is created by pressing the <kbd>p</kbd> key.
   After dragging the first segment a mouse button clock will create the second point and so on.
   A double click ends the placement.<br>