[chore] Fix minor typo in About template (#3502)

web/template/about.tmpl

@@ -172,7 +172,7 @@ Polls can have up to
             <p>
                 ActivityPub instances federate with other instances by exchanging data with them over the network.
                 Exchanged data includes things like accounts, statuses, likes, boosts, and media attachments.
-                This exchange of data can prevented for instances on specific domains via a domain block created
+                This exchange of data can be prevented for instances on specific domains via a domain block created
                 by an instance admin. When an instance is domain blocked by another instance:
             </p>
             <ul>
@@ -190,4 +190,4 @@ Polls can have up to
         </div>
     </section>
 </main>
-{{- end }}
+{{- end }}