Remove 'compairing raw pointers'

Author: eholk

src/const_eval.md

@@ -89,7 +89,6 @@ Notable features that are allowed in const contexts but not in const functions i
 * floating point operations
   * floating point values are treated just like generic parameters without trait bounds beyond
   `Copy`. So you cannot do anything with them but copy/move them around.
-* comparing raw pointers
 
 Conversely, the following are possible in a const function, but not in a const context: