*ping* [patch, wwwdocs] Mention POWER IEEE128 changes for gcc 12

[Thomas Koenig]

Hi Mikael,

> OK in any case.  Anything is better than nothing.

Here is what I committed, with one final tweak.

Thanks!

Best regards

	Thomas

--- a/htdocs/gcc-12/changes.html
+++ b/htdocs/gcc-12/changes.html
@@ -501,6 +501,15 @@ function Multiply (S1, S2 : Sign) return Sign is
      conforming to the Fortran 2018 standard.  Previous versions
      used <code>OPERATOR</code> which conforms to TS 18508.
    </li>
+  <li>
+    On POWER systems which support it, the 
<code>-mabi=ieeelongdouble</code>
+    option now selects the IEEE 128-bit floating point format
+    for <code>REAL(KIND=16)</code>.
+    <code>R16_IBM</code> and <code>R16_IEEE</code> have been added to the
+    <code>-fconvert</code> option, the <code>CONVERT</code> specifyer of
+    the <code>OPEN</code> statement and the 
<code>GFORTRAN_CONVERT_UNIT</code>
+    environment variable.
+  </li>
  </ul>