docs(kmir): mark bridge projection rules as temporary

Author: Stevengre

kmir/src/kmir/kdist/mir-semantics/rt/data.md

@@ -509,6 +509,7 @@ The following rule resolves this situation by using the head element.
         => #traverseProjection(DEST, VALUE, projectionElemField(IDX, TY) PROJS, CTXTS) ... </k> // TODO mark context?
     [preserves-definedness, priority(100)]
 
+  // Temporary bridge rule for the current mixed bare-value/Range representation.
   rule <k> #traverseProjection(
              DEST,
              Range(ListItem(Union(_, _) #as VALUE) _REST:List),
@@ -658,6 +659,7 @@ Similar to `ConstantIndex`, the slice _end_ index may count from the _end_  or t
      andBool START <=Int size(ELEMENTS) -Int END
     [preserves-definedness] // Indexes checked to be in range for ELEMENTS
 
+  // Temporary bridge rule for the current mixed bare-value/Range representation.
   rule <k> #traverseProjection(
              DEST,
              VAL,