Documentation links in the README have not been updated following the move to pure Asciidoctor

[JEuler]

Please check the links for the documentation in the readme file for repo. It seems, that they are not working.
https://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/ - should be https://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/html/

[wilkinsona]

Thanks. Looks like we missed this as part of #12611.