Fix explainer link

Author: eemeli

spec.emu

@@ -10,7 +10,7 @@ location: https://eemeli.org/proposal-intl-datetime-alignment/
 
 <emu-intro id="intro">
   <h1>Introduction</h1>
-  <p>An explainer for this proposal is available at <a href="https://eemeli.org/proposal-intl-datetime-alignment/">eemeli.org/proposal-intl-datetime-alignment</a>.</p>
+  <p>An explainer for this proposal is available at <a href="https://github.com/eemeli/proposal-intl-datetime-alignment">github.com/eemeli/proposal-intl-datetime-alignment</a>.</p>
 </emu-intro>
 
 <emu-clause id="datetimeformat-objects" number="11">