Use consistent formatting for module-level comments.

lib/wasm/src/environ/dummy.rs

@@ -1,3 +1,5 @@
+//! "Dummy" environment for testing wasm translation.
+
 use environ::{FuncEnvironment, GlobalValue, ModuleEnvironment};
 use translation_utils::{Global, Memory, Table, GlobalIndex, TableIndex, SignatureIndex,
                         FunctionIndex, MemoryIndex};

lib/wasm/src/environ/mod.rs

@@ -1,3 +1,5 @@
+//! Support for configurable wasm translation.
+
 mod spec;
 mod dummy;
 

lib/wasm/src/translation_utils.rs

@@ -1,4 +1,4 @@
-///! Helper functions and structures for the translation.
+//! Helper functions and structures for the translation.
 use wasmparser;
 use cretonne;
 use std::u32;