Fixes typo

Co-authored-by: Ted Thibodeau Jr <[email protected]>

Author: hartig

spec/index.html

@@ -8997,8 +8997,8 @@ <h5>SELECT Expressions</h5>
         </section>
         <section id="convertSolMod">
           <h4>Converting Solution Modifiers</h4>
-          <p>Solutions modifiers apply to the processing of a SPARQL query after pattern matching.</p>
-          <p>However, since the solutions modifiers operate on sequences
+          <p>Solution modifiers apply to the processing of a SPARQL query after pattern matching.</p>
+          <p>However, 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