docs/reference: Update constrained docs now that tuples are const.

dpgeorge · dpgeorge · commit 07e743ea078a · 2022-04-11T23:40:42.000+10:00
Signed-off-by: Damien George &lt;damien@micropython.org&gt;
diff --git a/docs/reference/constrained.rst b/docs/reference/constrained.rst
@@ -146,17 +146,12 @@ As in the string example, at runtime a reference to the arbitrarily large
 integer is assigned to the variable ``bar``. That reference occupies a
 single machine word.
 
-It might be expected that tuples of integers could be employed for the purpose
-of storing constant data with minimal RAM use. With the current compiler this
-is ineffective (the code works, but RAM is not saved).
+Tuples of constant objects are also constant.  For example:
 
 .. code::
 
     foo = (1, 2, 3, 4, 5, 6, 100000)
 
-At runtime the tuple will be located in RAM. This may be subject to future
-improvement.
-
 **Needless object creation**
 
 There are a number of situations where objects may unwittingly be created and
