[DependencyInjection] Fix a typo

src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php

@@ -207,7 +207,7 @@ class YamlFileLoader extends FileLoader
 
             foreach ($service['tags'] as $tag) {
                 if (!isset($tag['name'])) {
-                    throw new \InvalidArgumentException(sprintf('A "tags" entry is missing a "name" key must be an array for service "%s" in %s.', $id, $file));
+                    throw new \InvalidArgumentException(sprintf('A "tags" entry is missing a "name" key for service "%s" in %s.', $id, $file));
                 }
 
                 $name = $tag['name'];

tests/Symfony/Tests/Component/DependencyInjection/Loader/YamlFileLoaderTest.php

@@ -182,7 +182,7 @@ class YamlFileLoaderTest extends \PHPUnit_Framework_TestCase
             $this->fail('->load() should throw an exception when a tag is missing the name key');
         } catch (\Exception $e) {
             $this->assertInstanceOf('\InvalidArgumentException', $e, '->load() throws an InvalidArgumentException if a tag is missing the name key');
-            $this->assertStringStartsWith('A "tags" entry is missing a "name" key must be an array for service ', $e->getMessage(), '->load() throws an InvalidArgumentException if a tag is missing the name key');
+            $this->assertStringStartsWith('A "tags" entry is missing a "name" key for service ', $e->getMessage(), '->load() throws an InvalidArgumentException if a tag is missing the name key');
         }
     }
 }