Document workaround for `got` `FormData` bug

See: https://github.com/sindresorhus/got/pull/466

js/modules/debuglogs.js

@@ -9,6 +9,7 @@ const BASE_URL = 'https://debuglogs.org';
 // Workaround: Submitting `FormData` using native `FormData::submit` procedure
 // as integration with `got` results in S3 error saying we haven’t set the
 // `Content-Length` header:
+// https://github.com/sindresorhus/got/pull/466
 const submitFormData = (form, url) =>
   new Promise((resolve, reject) => {
     form.submit(url, (error) => {
@@ -42,6 +43,8 @@ exports.upload = async (content) => {
     filename: 'signal-desktop-debug-log.txt',
   });
 
+  // WORKAROUND: See comment on `submitFormData`:
+  // await got.post(url, { body: form });
   await submitFormData(form, url);
 
   return `${BASE_URL}/${fields.key}`;