Update documentation: Names of YAML files that needs to be specifically named.

In-Depth Discussions
1

At https://docs.getdbt.com/best-practices/how-we-structure/5-the-rest-of-the-project doc page it says,

It’s important to note that while the top-level YAML files 
(dbt_project.yml, packages.yml) need to be specifically named 
and in specific locations, the files containing your sources and 
models dictionaries can be named, located, and organized however 
you want.

I think we should also add connection profile file: profiles.yml in this list of file that needs to be specifically named.

I can send a PR if it makes sense.

2

I think selectors.yml also fits the bill.