Fix typo (#145)

Multiple approvals, trivial editorial correction, merging

Author: chrisn

index.html

@@ -457,7 +457,7 @@ <h4>Issue and Present Claims</h4>
 Neru would like to issue digital credentials on behalf of her company that
 contain claims about their employees. The claims that are made need to use
 identifiers that are cryptographically attributable back to Neru's company and
-need to allow for the holder's of those credentials to be able to
+need to allow for the holders of those credentials to be able to
 cryptographically authenticate themselves when they present the credential.
           </p>
         </section>