options.delimiters
Type: String
Default: ---

Open and close delimiters can be passed in as an array of strings.

Example:

// format delims as a string
matter.read('file.md', {delims: '~~~'});
// or an array (open/close)
matter.read('file.md', {delims: ['~~~', '~~~']});

the example is wrong.
it should use delimiters instead of delims.

like that:

Example:

/