ARMv7: help/usage updates

Provide helptext which was sometimes missing; update some of it
to be more accurate.

Usage syntax messages have the same EBNF as the User's Guide;
there should be no angle brackets in either place.

Don't use "&function"; functions are like arrays, their address
is their name.  Shrink some overlong lines, remove some empties.

Add a couple comments about things that should change:  those
extra TCK cycles for MEM-AP reads are in the wrong place (that
might explain some problems we've seen); the DAP command tables
should be shared, not copied.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

doc/openocd.texi

@@ -6198,26 +6198,28 @@ These commands are specific to ARM architecture v7 Debug Access Port (DAP),
 included on Cortex-M3 and Cortex-A8 systems.
 They are available in addition to other core-specific commands that may be available.
 
-@deffn Command {dap info} [num]
-Displays dap info for ap @var{num}, defaulting to the currently selected AP.
+@deffn Command {dap apid} [num]
+Displays ID register from AP @var{num},
+defaulting to the currently selected AP.
 @end deffn
 
 @deffn Command {dap apsel} [num]
 Select AP @var{num}, defaulting to 0.
 @end deffn
 
-@deffn Command {dap apid} [num]
-Displays id register from AP @var{num},
+@deffn Command {dap baseaddr} [num]
+Displays debug base address from MEM-AP @var{num},
 defaulting to the currently selected AP.
 @end deffn
 
-@deffn Command {dap baseaddr} [num]
-Displays debug base address from AP @var{num},
+@deffn Command {dap info} [num]
+Displays the ROM table for MEM-AP @var{num},
 defaulting to the currently selected AP.
 @end deffn
 
 @deffn Command {dap memaccess} [value]
-Displays the number of extra tck for mem-ap memory bus access [0-255].
+Displays the number of extra tck cycles in the JTAG idle to use for MEM-AP
+memory bus access [0-255], giving additional time to respond to reads.
 If @var{value} is defined, first assigns that.
 @end deffn