Refer to Datastore everywhere correctly by its capitalized form

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=147479683

java/google/registry/whois/DomainOrHostLookupCommand.java

@@ -49,7 +49,7 @@ public abstract class DomainOrHostLookupCommand implements WhoisCommand {
     throw new WhoisException(now, SC_NOT_FOUND, errorPrefix + " not found.");
   }
 
-  /** Renders a response record, provided its successfully retrieved datastore entity. */
+  /** Renders a response record, provided its successfully retrieved Datastore entity. */
   protected abstract Optional<WhoisResponse> getResponse(
       InternetDomainName domainName, DateTime now);
 }

java/google/registry/whois/WhoisResponseImpl.java

@@ -150,7 +150,7 @@ abstract class WhoisResponseImpl implements WhoisResponse {
     /** Returns raw text that should be appended to the end of ALL WHOIS responses. */
     E emitLastUpdated(DateTime timestamp) {
       // We are assuming that our WHOIS database is always completely up to date, since it's
-      // querying the live backend datastore.
+      // querying the live backend Datastore.
       stringBuilder
           .append(">>> Last update of WHOIS database: ")
           .append(UtcDateTimeAdapter.getFormattedString(timestamp))