error ane: multiple corrections must end with trailing ","

I wonder if there is some rationale for such formatting requirement?

Note the last comma! You need to use it, otherwise the last suggestion will be discarded (see below for why).

Note that there isn't a comma at the end of the line. The last argument is treated as the reason why a suggestion cannot be automatically applied.

sorry @DimitriPapadopoulos , must be a Friday but I am still missing while trailing , is needed.

From the README:

3. Entry with one word, but with automatic fix disabled:

   clas->class, disabled because of name clash in c++
   

   Note that there isn't a comma at the end of the line. The last argument is treated as the reason why a suggestion cannot be automatically applied.

I can see that as a "feature" for a single choice, but with multiple choices - none of them can be automatically applied, so semantic of the trailing , is redundant/not needed, right?

Even with multiple choices, whatever's after the last coma is a comment. It's probably too late to change this.