Remove outdated warning about 'stalled' state

Closes #305

Author: ddemidov

ev3dev/core.py

@@ -881,15 +881,6 @@ def wait_until(self, s, timeout=None):
         there is an I/O event related to the ``state`` attribute.  Exits early
         when ``timeout`` (in milliseconds) is reached.
 
-        .. warning::
-            In ev3dev kernel release cycles 16 and earlier, there is a bug
-            which causes the ``state`` attribute to include ``stalled``
-            immediately after starting the motor even if it is not actually
-            being prevented from rotating. As a workaround, we recommend
-            sleeping your code for around 100ms after starting a motor if you
-            are going to use this method to wait for it to be ``stalled``. A
-            fix for this has not yet been released.
-
         Returns ``True`` if the condition is met, and ``False`` if the timeout
         is reached.
 
@@ -905,15 +896,6 @@ def wait_while(self, s, timeout=None):
         when there is an I/O event related to the ``state`` attribute.  Exits
         early when ``timeout`` (in milliseconds) is reached.
 
-        .. warning::
-            In ev3dev kernel release cycles 16 and earlier, there is a bug
-            which causes the ``state`` attribute to include ``stalled``
-            immediately after starting the motor even if it is not actually
-            being prevented from rotating. As a workaround, we recommend
-            sleeping your code for around 100ms after starting a motor if you
-            are going to use this method to wait while it is ``stalled``. A
-            fix for this has not yet been released.
-
         Returns ``True`` if the condition is met, and ``False`` if the timeout
         is reached.