SpringBoot Misprint in migration wiki guide

A misprint at https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-Config-Data-Migration-Guide#muti-document-yaml-ordering

Muti-document YAML Ordering

l missed, i.e. should be Multi-document YAML Ordering

and in the last sentence

insternal

should be internal P.S. i failed to find any edit button to create a PR for that

Comment From: mbhave

Good catch @snuyanzin. I've fixed it in the wiki.