Fix thread-safety note

Author: jstasiak

docs/api.rst

@@ -1,12 +1,14 @@
 Injector API reference
 ======================
 
-.. notice:: Unless specified otherwise, instance methods are **not** thread safe.
+.. note::
 
-The following functions are thread safe:
+    Unless specified otherwise, instance methods are **not** thread safe.
 
--   :meth:`Injector.get`
--   injection provided by :func:`inject` decorator (please note, however, that it doesn't say anything about decorated function thread safety)
+    The following functions are thread safe:
+
+    * :meth:`Injector.get`
+    * injection provided by :func:`inject` decorator (please note, however, that it doesn't say anything about decorated function thread safety)
 
 
 .. automodule:: injector