debugger doc updated for rewind/unwind operations

docs/debugger.html

@@ -1212,19 +1212,24 @@ the RAM in the DPC scheme is not viewable by the 6507, so its addresses start fr
 <br>
 <h2>Global Buttons</h2>
 
-<p>There are also buttons on the right that always show up no matter which
-tab you're looking at. These are always active.  The larger button to the left
-(labeled '&lt;') performs the rewind operation, which will undo the previous
-Step/Trace/Scan/Frame advance.  The rewind buffer is currently 100 levels deep.
-The others are Step, Trace, Scan+1, Frame+1 and Exit.</p>
+<p>There are also buttons on the right top that always show up no matter which
+tab you're looking at. The larger button at the left top (labeled '&lt;') performs
+the rewind operation, which will undo the previous Step/Trace/Scan/Frame advance,
+the smaller button at the left bottom (labeled '&gt;') performs the unwind operation,
+which will undo the previous rewind operation.
+
+The rewind buffer is 100 levels deep by default.</br></br>
+
+The other operations are Step, Trace, Scan+1, Frame+1 and Exit.</p>
 <p><img src="graphics/debugger_globalbuttons.png"></p>
 
 <p>When you use these buttons, the prompt doesn't change. This means the
 status lines with the registers and disassembly will be "stale". You
 can update them just by re-running the relevant commands in the prompt.</p>
 
-<p>You can also use the Step, Trace, Scan+1, Frame+1 and Rewind buttons from anywhere
-in the GUI via the keyboard, with Control-S, Control-T, Control-L, Control-F and Control-R.</p>
+<p>You can also use the Step, Trace, Scan+1, Frame+1, Rewind and Unwind buttons from
+anywhere in the GUI via the keyboard, with Control-S, Control-T, Control-L, Control-F,
+Control-R and Control-Shift-R.</p>
 
 
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