Document the change in MacPython distutils installation location

contrib/macosx/Readme.html

@@ -25,7 +25,7 b''
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 <p class="p1"><b>After you install</b></p>
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-<p class="p3">This package installs the <span class="s2">hg</span> executable in <span class="s2">/usr/local/bin</span>. This directory may not be in your shell's search path. Don't forget to check.</p>
+<p class="p3">This package installs the <span class="s2">hg</span> executable in <span class="s2">/Library/Frameworks/Python.framework/Versions/Current/bin</span>. This directory may not be in your shell's search path. The MacPython installer will have created an entry in <span class="s2">.profile</span> for it but if your shell doesn't use <span class="s2">.profile</span> you'll need configure it yourself or create a symlink from a directory already in your path.</p>
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 <p class="p1"><b>Reporting problems</b></p>
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