[PATCH, wwwdocs] Update list of ARM cpus in readings.html

[Richard Earnshaw (lists)]

The list of ARM CPUs in readings.html is now looking rather dated.  This
patch updates the list to refer to the most commonly available parts (or
at least, the product families by which they are known).

Committed.

R.
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? backends.html~
? index.html.~1.866.~
? readings.html.~1.260.~
? svn.html.~1.183.~
? svn.html~
Index: readings.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/readings.html,v
retrieving revision 1.260
diff -u -r1.260 readings.html
--- readings.html	12 Feb 2017 08:10:51 -0000	1.260
+++ readings.html	22 Feb 2017 11:14:29 -0000
@@ -80,7 +80,7 @@
 
  <li>ARM
   <br />Manufacturer: Various, by license from ARM.
-  <br />CPUs include: ARM7 and ARM7T series (eg. ARM7TDMI), ARM9 and StrongARM
+  <br />CPUs include: ARM7TDMI, and the Cortex-A, Cortex-R and Cortex-M series.
   <br /><a href="http://infocenter.arm.com/help/index.jsp">ARM Documentation</a>
  </li>