Refer to Datastore everywhere correctly by its capitalized form

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

java/google/registry/mapreduce/MapreduceRunner.java

@@ -62,7 +62,7 @@ public class MapreduceRunner {
   private final Optional<Integer> httpParamMapShards;
   private final Optional<Integer> httpParamReduceShards;
 
-  // Default to 3 minutes since many slices will contain datastore queries that time out at 4:30.
+  // Default to 3 minutes since many slices will contain Datastore queries that time out at 4:30.
   private Duration sliceDuration = Duration.standardMinutes(3);
   private String jobName;
   private String moduleName;

java/google/registry/mapreduce/inputs/EppResourceEntityReader.java

@@ -33,7 +33,7 @@ class EppResourceEntityReader<R extends EppResource> extends EppResourceBaseRead
    * The resource classes to postfilter for.
    *
    * <p>This can be {@link EppResource} or any descendant classes, regardless of whether those
-   * classes map directly to a kind in datastore, with the restriction that none of the classes
+   * classes map directly to a kind in Datastore, with the restriction that none of the classes
    * is a supertype of any of the others.
    */
   private final ImmutableSet<Class<? extends R>> resourceClasses;