Remove old TODO from parser grammar

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/syn/parser.y

@@ -46,11 +46,6 @@ UnExpr -> Result<Expr>:
     |   CallIndexExpr { $1 }
     ;
 
-// TODO - add CallExpr and IndexExpr, allow them to nest
-//      - UnExpr will point to CallIndexExpr
-//      - Call/Index exprs are based on an AccessExpr
-//      - AccessExpr will retain ExprTrailing in between its items, but should end in a .ident
-
 CallIndexExpr -> Result<Expr>:
         IndexExpr { $1 }
     |   CallExpr { $1 }