Explicit requirements for rdf:langString and rdf:dirLangString - alternative

alternative to #212

Author: pchampin

spec/index.html

@@ -962,8 +962,8 @@ <h3>Literals</h3>
       <li>If and only if the <a>datatype IRI</a> is
         <code>http://www.w3.org/1999/02/22-rdf-syntax-ns#langString</code> or
         <code>http://www.w3.org/1999/02/22-rdf-syntax-ns#dirLangString</code>, a
-        non-empty <dfn class="export">language tag</dfn> as defined by [[!BCP47]]. The
-        language tag MUST be well-formed according to
+        non-empty <dfn class="export">language tag</dfn> as defined by [[!BCP47]]
+        The language tag MUST be well-formed according to
         <a data-cite="bcp47#section-2.2.9">section 2.2.9</a>
         of [[!BCP47]],
         and MUST be treated accordingly, that is, in a case-insensitive manner.