DATACMNS-1085 - Fixed typos in Javadoc.

Original pull request: #229.

src/main/java/org/springframework/data/querydsl/QuerydslPredicateExecutor.java

@@ -102,7 +102,7 @@ public interface QuerydslPredicateExecutor<T> {
 	/**
 	 * Checks whether the data store contains elements that match the given {@link Predicate}.
 	 *
-	 * @param predicate the {@link Predicate} to use for the existance check, can be {@literal null}.
+	 * @param predicate the {@link Predicate} to use for the existence check, can be {@literal null}.
 	 * @return {@literal true} if the data store contains elements that match the given {@link Predicate}.
 	 */
 	boolean exists(Predicate predicate);

src/main/java/org/springframework/data/querydsl/binding/QuerydslPredicate.java

@@ -33,7 +33,7 @@ import java.lang.annotation.Target;
 public @interface QuerydslPredicate {
 
 	/**
-	 * The root type to create the {@link com.mysema.query.types.Predicate}. Specify this explictly if the type is not
+	 * The root type to create the {@link com.mysema.query.types.Predicate}. Specify this explicitly if the type is not
 	 * contained in the controller method's return type.
 	 * 
 	 * @return