Fix typo

res/composer-schema.json

@@ -274,7 +274,7 @@
             "properties": {
                 "psr-0": {
                     "type": "object",
-                    "description": "This is a hash of namespaces (keys) and the directories they can be found into (values, can be arrays of paths) by the autoloader.",
+                    "description": "This is a hash of namespaces (keys) and the directories they can be found in (values, can be arrays of paths) by the autoloader.",
                     "additionalProperties": true
                 },
                 "psr-4": {