Just attended a Facebook Live with FamilySearch’s Ron Tanner. He made the following statements, paraphrased below.
On selected indexed image sets at FamilySearch you can now correct misspelled names in the index.
When viewing the image, scroll down to the bottom where the index list is shown. Click on the appropriate entry, type your correction and specify if it’s an index error or if the original document is in error.
Ron said It will take much time before this is rolled out to all indexed image sets, since FamilySearch engineers must first work the next 18 months or so update the backend architecture.