Address comments from WebAssembly#7149 (WebAssembly#7152)

The PR was accidentally merged without these fixes included.

Author: tlively

CHANGELOG.md

@@ -17,7 +17,8 @@ Current Trunk
 
  - BinaryenSelect no longer takes a type parameter.
  - AutoDrop APIs have been removed.
- - Binaryen now supports parsing control flow structures with parameter types.
+ - Binaryen now supports parsing control flow structures with parameter types by
+   lowering them away in the parsers..
 
 v120
 ----

src/wasm-binary.h

@@ -1467,7 +1467,7 @@ class WasmBinaryReader {
 
   bool getBasicType(int32_t code, Type& out);
   bool getBasicHeapType(int64_t code, HeapType& out);
-  // Get the signature of control flow structure.
+  // Get the signature of a control flow structure.
   Signature getBlockType();
   // Read a value and get a type for it.
   Type getType();