`notes` to `impl_url` property migration leftovers

[mfranzke]

          > This was actually already handled in #20608!

There are some leftovers existing in the codebase.

Originally posted by @mfranzke in https://github.com/mdn/browser-compat-data/issues/20794#issuecomment-1732329990

This PR converts various implementation notes into impl_url keys instead, which would allow for better machine readability if needed ("See bug XXXXX" have been migrated with https://github.com/mdn/browser-compat-data/pull/20608 already).

This change was primarily performed by the following regex and manually going through the results afterwards and analyzing for phrases that haven't been catched with the changes out of https://github.com/mdn/browser-compat-data/pull/20608): "notes":\s*"(\S|\s)+(https:\/\/(crbug\.com(\/[^\/]+)?|bugzil\.la|webkit\.org\/b))

[foolip]

@mfranzke how can we find the remaining cases? The regexp you posted doesn't work with git grep -E.

[mfranzke]

@mfranzke how can we find the remaining cases? The regexp you posted doesn't work with git grep -E.

sorry, I should have mentioned this (and just adapted it to this issues description): It's a regex that works in VS Code search.

[mfranzke]

I've only found one remaining occurance: https://github.com/mdn/browser-compat-data/pull/22287

[foolip]

Closing as that was the last one then. Thanks @mfranzke 🙏