Update region guidelines

Updating the rules on the region section for contributing company information as per remoteintech#485

CONTRIBUTING.md

@@ -8,11 +8,9 @@ Pull requests will be accepted based on the following:
 1. If the company is at least partially remote
 1. If you add the company in alphabetical order in the list
 1. If you submit the company with a website
-1. If you submit the company with the regions that are accepted for remote positions (US only? Worldwide? Specific timezones?) \*
+1. If you submit the company with the regions that are accepted for remote positions (for more details see the instructions in the [example company profile](/company-profiles/example.md))
 1. If you submit a company profile page and link the company name to it (see example [here](/company-profiles/example.md))
 
-\* Optional, but highly recommended
-
 Please adhere to the [Contributor Code of Conduct](CODE_OF_CONDUCT.md).
 
 Thanks for contributing!