Unify formatting of stopword

Co-authored-by: Geir Storli <[email protected]>

en/reference/schema-reference.html

@@ -4009,9 +4009,9 @@ <h2 id="weakand">weakand</h2>
           This will drop all query terms that occur in at least 60% of the documents.
         </p>
         <p>
-          Using <code>stopword-limit</code> is similar to explicitly removing stop words
+          Using <code>stopword-limit</code> is similar to explicitly removing stopwords
           from the query up front, but has the benefit of dynamically adapting to the
-          actual document corpus and not having to know—or specify—a set of stop-words.
+          actual document corpus and not having to know—or specify—a set of stopwords.
         </p>
       </td>
     </tr>
@@ -4029,7 +4029,7 @@ <h2 id="weakand">weakand</h2>
         <p>
         <p>
           This can be used to efficiently <em>exclude</em> documents that only match terms that
-          occur very frequently in the document corpus. Such terms are likely to be stop-words
+          occur very frequently in the document corpus. Such terms are likely to be stopwords
           that have low semantic value for the query, and excluding documents only containing
           them is likely to only have a minor impact on recall.
         </p>