Use consistent formatting for module-level comments.

lib/cretonne/src/ir/immediates.rs

@@ -1,4 +1,3 @@
-
 //! Immediate operands for Cretonne instructions
 //!
 //! This module defines the types of immediate operands that can appear on Cretonne instructions.

lib/cretonne/src/ir/types.rs

@@ -3,12 +3,6 @@
 use std::default::Default;
 use std::fmt::{self, Display, Debug, Formatter};
 
-// ====--------------------------------------------------------------------------------------====//
-//
-// Value types
-//
-// ====--------------------------------------------------------------------------------------====//
-
 /// The type of an SSA value.
 ///
 /// The `VOID` type is only used for instructions that produce no value. It can't be part of a SIMD