[rfa] Fix comment in can_use_hardware_watchpoint

[Thiago Jung Bauermann <bauerman@br.ibm.com>]

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Hi,

Ulrich Weigand elucidated a question asked in a comment in
can_use_hardware_watchpoint. This patch fixes it.

Thanks and regards,
Thiago Jung Bauermann
IBM Linux Technology Center


2010-07-01  Ulrich Weigand  <uweigand@de.ibm.com>
	    Thiago Jung Bauermann  <bauerman@br.ibm.com>

	* breakpoint.c (can_use_hardware_watchpoint): Answer "what does this
	represent?" question in comment.  Change comment to a proper sentence.


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Index: gdb/breakpoint.c
===================================================================
--- gdb.orig/breakpoint.c	2010-06-30 23:24:53.000000000 -0300
+++ gdb/breakpoint.c	2010-06-30 23:25:02.000000000 -0300
@@ -8147,9 +8147,9 @@ can_use_hardware_watchpoint (struct valu
 	}
       else if (VALUE_LVAL (v) != not_lval
 	       && deprecated_value_modifiable (v) == 0)
-	return 0;	/* ??? What does this represent? */
+	return 0;	/* These are values from the history (e.g., $1).  */
       else if (VALUE_LVAL (v) == lval_register)
-	return 0;	/* cannot watch a register with a HW watchpoint */
+	return 0;	/* Cannot watch a register with a HW watchpoint.  */
     }
 
   /* The expression itself looks suitable for using a hardware