Update pre_osx.html

Added note that latest version of macports on Sequoia15.1 wanted python310 instead of python-310

Author: cholland

docs/build/pre_osx.html

@@ -105,7 +105,7 @@ <h1>OSX Sonoma<a class="headerlink" href="#osx-sonoma" title="Link to this headi
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ sudo port -v selfupdate
 </pre></div>
 </div>
-<p>Install python:</p>
+<p>Install python (note you may need to use python310 instead of python-310 on more recent systems):</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ sudo port install python-310
 $ sudo port select --set python python-310
 $ sudo port select --set python3 python-310
@@ -151,4 +151,4 @@ <h1>OSX Sonoma<a class="headerlink" href="#osx-sonoma" title="Link to this headi
   </script> 
 
 </body>
-</html>
+</html>