Add and extend deprecation annotations

Author: mpdude

src/Query/Exec/SingleSelectExecutor.php

@@ -14,6 +14,8 @@
  * Executor that executes the SQL statement for simple DQL SELECT statements.
  *
  * @link        www.doctrine-project.org
+ *
+ * @deprecated This class is no longer needed by the ORM and will be removed in 4.0.
  */
 class SingleSelectExecutor extends AbstractSqlExecutor
 {

src/Query/ParserResult.php

@@ -72,7 +72,7 @@ public function setResultSetMapping(ResultSetMapping $rsm): void
     /**
      * Sets the SQL executor that should be used for this ParserResult.
      *
-     * @deprecated
+     * @deprecated The SqlExecutor will be removed from ParserResult in 4.0. Provide a SqlFinalizer instead that can create the executor.
      */
     public function setSqlExecutor(AbstractSqlExecutor $executor): void
     {
@@ -90,7 +90,7 @@ public function setSqlExecutor(AbstractSqlExecutor $executor): void
     /**
      * Gets the SQL executor used by this ParserResult.
      *
-     * @deprecated
+     * @deprecated The SqlExecutor will be removed from ParserResult in 4.0. Provide a SqlFinalizer instead that can create the executor.
      */
     public function getSqlExecutor(): AbstractSqlExecutor
     {