Use warning directive for warning clauses

Author: ddemidov

ev3dev/core.py

@@ -843,15 +843,16 @@ def wait_until(self, s, timeout=None):
         Blocks until ``s`` is in ``self.state``.  The condition is checked 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 for it to be ``stalled``. A fix for this has not
-        yet been released.
-        
+
+        .. 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.
 
@@ -866,15 +867,16 @@ def wait_while(self, s, timeout=None):
         Blocks until ``s`` is not in ``self.state``.  The condition is checked
         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 for it to be ``stalled``. A fix for this has not
-        yet been released.
-        
+
+        .. 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.