Fix: Typo / wording

src/Composer/Package/Locker.php

@@ -102,7 +102,7 @@ class Locker
     }
 
     /**
-     * Checks whether locker were been locked (lockfile found).
+     * Checks whether locker has been locked (lockfile found).
      *
      * @return bool
      */

src/Composer/Plugin/Capability/CommandProvider.php

@@ -25,7 +25,7 @@ namespace Composer\Plugin\Capability;
 interface CommandProvider extends Capability
 {
     /**
-     * Retreives an array of commands
+     * Retrieves an array of commands
      *
      * @return \Composer\Command\BaseCommand[]
      */