Fix table refs and superscript.

Fixing references to a table and a superscript.

xml/hwbp_registers.xml

@@ -339,11 +339,11 @@
         implementations, execute, load, and store address/data triggers may fire at
         whatever point in time is most convenient for the implementation.
         The debugger may request specific timings as described in {mcontrol-timing}.
-        Table~\ref{tab:hwbp_timing} suggests timings for the best user experience.
+        <<tab:hwbp_timing>> suggests timings for the best user experience.
 
         A chain of triggers that don't all have the same {mcontrol-timing}
         value will never fire. That means to implement the suggestions in
-        Table~\ref{tab:hwbp_timing}, both timings should be supported on load
+        <<tab:hwbp_timing>>, both timings should be supported on load
         address triggers.
 
         The Privileged Spec says that breakpoint exceptions that occur on
@@ -366,7 +366,7 @@
             logarithm base 2 of the number of bytes in that range.
             A value of 0 indicates {mcontrol-match} 1 is not supported.
             A value of 63 corresponds to the maximum NAPOT range, which is
-            $2^{63}$ bytes in size.
+            2^63^ bytes in size.
         </field>
         <field name="0" bits="XLEN-12:23" access="R" reset="0" />
         <field name="sizehi" bits="22:21" access="WARL" reset="0">