Fix grammar in runtime discovery of service instance text.

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

index.html

@@ -677,7 +677,7 @@ <h3>Service Instances</h3>
       </p>
       <p>
 A coordinator instance MAY have access to multiple service instances in order to support different use cases.
-Runtime discovery of service instance configuration is not supported by the VC API as it is expected that services are known to coordinator at the time of coordinator deployment.
+Runtime discovery of service instance configuration is not supported by the VC API as services are expected to be known by the coordinator at the time of coordinator deployment.
       </p>
     </section>
     <section>