Fix grammar related to schema.org vocab hash.

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

index.html

@@ -6031,12 +6031,12 @@ <h3>Vocabularies</h3>
         </p>
 
         <p class="note"
-            title="schema.org changes regularly, but considered stable">
+            title="schema.org changes regularly, but is considered stable">
 Implementers and document authors might note that cryptographic digests for
-`schema.org` are not provided. This is due to the `schema.org` vocabulary
-undergoing regular changes; any digest provided would be out of date within
+`schema.org` are not provided. This is because the `schema.org` vocabulary
+undergoes regular changes; any digest provided would be out of date within
 weeks of publication. The Working Group discussed this concern and concluded
-that the vocabulary terms that are used from `schema.org`, by this
+that the vocabulary terms from `schema.org`, that are used by this
 specification, have been stable for years and are highly unlikely to change in
 their semantic meaning.
         </p>