Update HttpService.yaml with HTTP methods, explanations, and resources. (#978)

## Changes

Updated HttpService.yaml to provide a short description of each of the
HTTP methods, if they are permitted via Roblox scripts, and Mozilla
resources for each. This is a duplicate of pull request
#966 as the checks did not
seem to recognize the changes made to
tools/checks/utils/allowedHttpLinks.txt to allow the links to Mozilla
resources on each of the HTTP methods.

The only method not currently permitted by Roblox is the CONNECT method
which creates a secure information tunnel between the requested and
originating server. Makes sense why this isn't allowed, but its useful
information to include nonetheless.

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Author: sammygrey