Refer to Datastore everywhere correctly by its capitalized form

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

java/google/registry/model/contact/ContactResource.java

@@ -54,7 +54,7 @@ public class ContactResource extends EppResource
    * Unique identifier for this contact.
    *
    * <p>This is only unique in the sense that for any given lifetime specified as the time range
-   * from (creationTime, deletionTime) there can only be one contact in the datastore with this id.
+   * from (creationTime, deletionTime) there can only be one contact in Datastore with this id.
    * However, there can be many contacts with the same id and non-overlapping lifetimes.
    */
   String contactId;
@@ -163,7 +163,7 @@ public class ContactResource extends EppResource
    * Postal info for the contact.
    *
    * <p>The XML marshalling expects the {@link PostalInfo} objects in a list, but we can't actually
-   * persist them to datastore that way because Objectify can't handle collections of embedded
+   * persist them to Datastore that way because Objectify can't handle collections of embedded
    * objects that themselves contain collections, and there's a list of streets inside. This method
    * transforms the persisted format to the XML format for marshalling.
    */