fix typos

Author: xabbuh

Tests/DotenvTest.php

@@ -209,7 +209,7 @@ public function testLoadDirectory()
         $dotenv->load(__DIR__);
     }
 
-    public function testServerSuperglobalIsNotOverriden()
+    public function testServerSuperglobalIsNotOverridden()
     {
         $originalValue = $_SERVER['argc'];
 
@@ -219,7 +219,7 @@ public function testServerSuperglobalIsNotOverriden()
         $this->assertSame($originalValue, $_SERVER['argc']);
     }
 
-    public function testEnvVarIsNotOverriden()
+    public function testEnvVarIsNotOverridden()
     {
         putenv('TEST_ENV_VAR=original_value');
         $_SERVER['TEST_ENV_VAR'] = 'original_value';
@@ -230,7 +230,7 @@ public function testEnvVarIsNotOverriden()
         $this->assertSame('original_value', getenv('TEST_ENV_VAR'));
     }
 
-    public function testHttpVarIsPartiallyOverriden()
+    public function testHttpVarIsPartiallyOverridden()
     {
         $_SERVER['HTTP_TEST_ENV_VAR'] = 'http_value';