Merge pull request #264 from mhchem/patch-1

Better use of MathJax.typesetPromise()

web/typeset.rst

@@ -79,7 +79,7 @@ calls.  For example,
    let promise = Promise.resolve();  // Used to hold chain of typesetting calls
 
    function typeset(code) {
-     promise = promise.then(() => {code(); return MathJax.typesetPromise()})
+     promise = promise.then(() => {return MathJax.typesetPromise(code());})
                       .catch((err) => console.log('Typeset failed: ' + err.message));
      return promise;
    }