DATAJPA-1676 - Fix some typos in JavaDoc.

Original pull request: #412.

src/main/java/org/springframework/data/jpa/repository/query/AbstractJpaQuery.java

@@ -363,7 +363,7 @@ public abstract class AbstractJpaQuery implements RepositoryQuery {
 			 * Otherwise this returns {@code true} even when the value from the backing {@code Tuple} is {@code null}.
 			 *
 			 * @param key the key for which to get the value from the map.
-			 * @return wether the key is an element of the backing tuple.
+			 * @return whether the key is an element of the backing tuple.
 			 */
 			@Override
 			public boolean containsKey(Object key) {

src/main/java/org/springframework/data/jpa/repository/query/StringQuery.java

@@ -410,7 +410,7 @@ class StringQuery implements DeclaredQuery {
 			}
 
 			/**
-			 * Returns the keyword that will tirgger the binding type or {@literal null} if the type is not triggered by a
+			 * Returns the keyword that will trigger the binding type or {@literal null} if the type is not triggered by a
 			 * keyword.
 			 *
 			 * @return the keyword

src/main/java/org/springframework/data/jpa/util/JpaMetamodelCacheCleanup.java

@@ -19,7 +19,7 @@ import org.springframework.beans.factory.DisposableBean;
 import org.springframework.context.ApplicationContext;
 
 /**
- * Simple component to be reigstered as Spring bean to clear the {@link JpaMetamodel} cache to avoid a memory leak in
+ * Simple component to be registered as Spring bean to clear the {@link JpaMetamodel} cache to avoid a memory leak in
  * applications bootstrapping multiple {@link ApplicationContext}s.
  * 
  * @author Oliver Gierke