pageURL is the relative path (without the site) of the sample URL. It must be one of the URLs returned by list_crawl_error_samples. For example, for the URL https://www.example.com/pagename on the site https://www.example.com/, the url value is pagename (string)
Category is one of: authPermissions, manyToOneRedirect, notFollowed, notFound, other, roboted, serverError, soft404.
Platform is one of: mobile, smartphoneOnly or web.
fix_sample_url(siteURL, pageURL, category = "notFound", platform = "web")The URL of the website to delete. Must include protocol (http://).
A PageUrl taken from list_crawl_error_samples.
Crawl error category. Default 'notFound'.
User agent type. Default 'web'.
TRUE if successful, raises an error if not.
See here for details: https://developers.google.com/webmaster-tools/v3/urlcrawlerrorssamples/markAsFixed
Other working with search console errors: crawl_errors,
error_sample_url,
list_crawl_error_samples