call out capitalization change since it's important but easy to miss

Co-Authored-By: Karishma Chadha <kchadha@media.mit.edu>

src/engine/mutation-adapter.js

@@ -13,6 +13,8 @@ const mutatorTagToObject = function (dom) {
     for (const prop in dom.attribs) {
         if (prop === 'xmlns') continue;
         obj[prop] = decodeHtml(dom.attribs[prop]);
+        // Note: the capitalization of block info in the following lines is important.
+        // The lowercase is read in from xml which normalizes case. The VM uses camel case everywhere else.
         if (prop === 'blockinfo') {
             obj.blockInfo = JSON.parse(obj.blockinfo);
             delete obj.blockinfo;