Small edit.

Co-authored-by: Andy Seaborne <[email protected]>

Author: hartig

spec/index.html

@@ -8998,7 +8998,7 @@ <h5>SELECT Expressions</h5>
         <section id="convertSolMod">
           <h4>Converting Solution Modifiers</h4>
           <p>Solution modifiers apply to the processing of a SPARQL query after pattern matching.</p>
-          <p>However, since the solution modifiers operate on sequences
+          <p>Since the solution modifiers operate on sequences
             of solution mappings, the query result produced up to this
             point is first turned from a multiset of solution mappings
             into such a sequence. While there is no implied ordering to