Fix JavaDoc.

Closes #2314

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

@@ -111,9 +111,8 @@ public abstract class JpaQueryExecution {
 	/**
 	 * Method to implement {@link AbstractStringBasedJpaQuery} executions by single enum values.
 	 *
-	 * @param query
-	 * @param accessor
-	 * @return
+	 * @param query must not be {@literal null}.
+	 * @param accessor must not be {@literal null}.
 	 */
 	@Nullable
 	protected abstract Object doExecute(AbstractJpaQuery query, JpaParametersParameterAccessor accessor);

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

@@ -129,10 +129,9 @@ public final class JpaQueryLookupStrategy {
 		/**
 		 * Creates a new {@link DeclaredQueryLookupStrategy}.
 		 *
-		 * @param em
-		 * @param extractor
-		 * @param queryMethodFactory
-		 * @param evaluationContextProvider
+		 * @param em must not be {@literal null}.
+		 * @param queryMethodFactory must not be {@literal null}.
+		 * @param evaluationContextProvider must not be {@literal null}.
 		 */
 		public DeclaredQueryLookupStrategy(EntityManager em, JpaQueryMethodFactory queryMethodFactory,
 				QueryMethodEvaluationContextProvider evaluationContextProvider) {
@@ -263,9 +262,7 @@ public final class JpaQueryLookupStrategy {
 	 * @param queryMethodFactory must not be {@literal null}.
 	 * @param key may be {@literal null}.
 	 * @param evaluationContextProvider must not be {@literal null}.
-	 * @param escape
-	 * @param extractor must not be {@literal null}.
-	 * @return
+	 * @param escape must not be {@literal null}.
 	 */
 	public static QueryLookupStrategy create(EntityManager em, JpaQueryMethodFactory queryMethodFactory,
 			@Nullable Key key, QueryMethodEvaluationContextProvider evaluationContextProvider, EscapeCharacter escape) {