[wwwdocs,applied] Mention -mno-call-main

[Georg-Johann Lay]

Applied the following avr news to gcc-15:

diff --git a/htdocs/gcc-15/changes.html b/htdocs/gcc-15/changes.html
index 7638d3d5..41425257 100644
--- a/htdocs/gcc-15/changes.html
+++ b/htdocs/gcc-15/changes.html
@@ -500,6 +500,10 @@ asm (".text; %cc0: mov %cc2, %%r0; .previous;"
        ><code>-msplit-ldst</code></a> and
     <a 
href="https://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html#index-msplit-bit-shift";
        ><code>-msplit-bit-shift</code></a>.</li>
+  <li>Support has been added for the new option
+    <a 
href="https://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html#index-mno-call-main";
+       ><code>-mno-call-main</code></a>.  Instead of calling 
<code>main</code>,
+    it will be located in section <code>.init9</code>.</li>
 </ul>
 <h3 id="x86">IA-32/x86-64</h3>

Johann