docs and fix

docs/code_snippets/dependency_injection_snippet.py

@@ -0,0 +1,12 @@
+from sqlite3 import Connection
+
+from argenta import Response, Router
+from argenta.di import FromDishka
+
+
+router = Router()
+
+@router.command('connect')
+def connect_handler(response: Response, connection: FromDishka[Connection]):
+	connection.execute('...')
+