[PATCH][wwwdocs] Improve arm and aarch64-related info in readings.html

[Kyrill Tkachov <kyrylo.tkachov@foss.arm.com>]

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Hi all,

I noticed that we have a readings.html page that has pointers to documentation of various backends that GCC supports.
The info on arm seems a bit out of date and somewhat confusing, and there is no entry for aarch64.
This patch tries to address that.

The arm entry is updated to not mention armv2(?) and thumb and an aarch64 entry is added with
a link to the ARM documentation.

Ok to commit?

Thanks,
Kyrill

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? readings.html~
Index: readings.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/readings.html,v
retrieving revision 1.242
diff -U 3 -r1.242 readings.html
--- readings.html	14 Nov 2015 23:40:21 -0000	1.242
+++ readings.html	15 Feb 2016 13:29:03 -0000
@@ -59,6 +59,11 @@
 </p>
 
 <ul>
+ <li>AArch64
+  <br /><a href="http://infocenter.arm.com/help/index.jsp">
+	ARM Documentation</a>
+ </li>
+
  <li>alpha
    <br />Manufacturer: Compaq (DEC)
    <br /><a href="http://www.tru64unix.compaq.com/docs/base_doc/DOCUMENTATION/V51A_HTML/ARH9MBTE/TITLE.HTM">Calling
@@ -81,12 +86,12 @@
   <br /><a href="http://www.synopsys.com/IP/PROCESSORIP/ARCPROCESSORS/Pages/default.aspx">ARC Documentation</a>
  </li>
 
- <li>arm (armv2, thumb)
-  <br />Manufacturer: Various, by license from ARM
+ <li>ARM
+  <br />Manufacturer: Various, by license from ARM.
   <br />CPUs include: ARM7 and ARM7T series (eg. ARM7TDMI), ARM9 and StrongARM
   <br /><a href="http://infocenter.arm.com/help/index.jsp">ARM Documentation</a>
  </li>
- 
+
  <li>AVR
   <br />Manufacturer: Atmel
   <br /><a href="http://www.atmel.com/products/microcontrollers/avr/">AVR Documentation</a>