Replace invalid return type annotations with {@inheritDoc}

tests/Doctrine/Tests/DBAL/Driver/DrizzlePDOMySql/DriverTest.php

@@ -39,7 +39,7 @@ class DriverTest extends PDOMySQLDriverTest
     }
 
     /**
-     * @return mixed[][]
+     * {@inheritDoc}
      */
     protected function getDatabasePlatformsForVersions() : array
     {

tests/Doctrine/Tests/DBAL/Platforms/OraclePlatformTest.php

@@ -93,7 +93,7 @@ class OraclePlatformTest extends AbstractPlatformTestCase
     }
 
     /**
-     * @return mixed[]
+     * {@inheritDoc}
      */
     public function getGenerateTableWithMultiColumnUniqueIndexSql() : array
     {
@@ -408,7 +408,7 @@ class OraclePlatformTest extends AbstractPlatformTestCase
     }
 
     /**
-     * @return mixed[]
+     * {@inheritDoc}
      */
     protected function getQuotedColumnInPrimaryKeySQL() : array
     {
@@ -416,7 +416,7 @@ class OraclePlatformTest extends AbstractPlatformTestCase
     }
 
     /**
-     * @return mixed[]
+     * {@inheritDoc}
      */
     protected function getQuotedColumnInIndexSQL() : array
     {
@@ -427,7 +427,7 @@ class OraclePlatformTest extends AbstractPlatformTestCase
     }
 
     /**
-     * @return mixed[]
+     * {@inheritDoc}
      */
     protected function getQuotedNameInIndexSQL() : array
     {
@@ -438,7 +438,7 @@ class OraclePlatformTest extends AbstractPlatformTestCase
     }
 
     /**
-     * @return mixed[]
+     * {@inheritDoc}
      */
     protected function getQuotedColumnInForeignKeySQL() : array
     {