Fix a comment typo

src/utils/adler32.js

@@ -24,7 +24,7 @@ var MOD = 65521;
 
 // This is a clean-room implementation of adler32 designed for detecting
 // if markup is not what we expect it to be. It does not need to be
-// cryptographically strong, only reasonable good at detecting if markup
+// cryptographically strong, only reasonably good at detecting if markup
 // generated on the server is different than that on the client.
 function adler32(data) {
   var a = 1;