[css-writing-modes] Appendix B is now Appendix A.

--HG--
extra : amend_source : 76b0db1d298151c55edf227762cb95420e151fff

Author: SimonSapin

css-writing-modes/Overview.bs

@@ -1045,7 +1045,7 @@ Introduction to Vertical Text Layout</h2>
     i.e. one that is either vertical-only or that is bi-orientational.
     A <dfn>horizontal script</dfn> is one that has a native horizontal orientation:
     i.e. one that is either horizontal-only or that is bi-orientational.
-    (See <a href="#script-orientations">Appendix B</a> for a categorization of
+    (See <a href="#script-orientations">Appendix C</a> for a categorization of
     scripts by native orientation.)
 
   <div class="figure">