Update link to refer to third-party cookie user choice

Explainer-IP-Geolocation.md

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 ## Context and Goals
 
-Location can be a key identifier for understanding what content is relevant for users. As Chrome prepares to [deprecates third party cookies](https://privacysandbox.com/), the Chrome team wants to ensure that we are taking appropriate steps to improve privacy on the web while also maintaining key use cases. We have [shared our proposal](https://github.com/GoogleChrome/ip-protection) for masking IP addresses for certain third party domains on the web. This comes with additional implications, like how IP addresses are used to understand the location of [GitHub - GoogleChrome/ip-protection](https://github.com/GoogleChrome/ip-protection) web users. This document outlines our initial proposal for how IP Protection will implement IP geolocation mappings.
+Location can be a key identifier for understanding what content is relevant for users. As Chrome prepares to [offer users an informed choice on third-party cookies](https://developers.google.com/privacy-sandbox/cookies/prepare/overview), the Chrome team wants to ensure that we are taking appropriate steps to improve privacy on the web while also maintaining key use cases. We have [shared our proposal](https://github.com/GoogleChrome/ip-protection) for masking IP addresses for certain third party domains on the web. This comes with additional implications, like how IP addresses are used to understand the location of [GitHub - GoogleChrome/ip-protection](https://github.com/GoogleChrome/ip-protection) web users. This document outlines our initial proposal for how IP Protection will implement IP geolocation mappings.
 
 It’s worth noting that IP geolocation—with or without IP Protection—only provides approximate and coarse location information and that there are ways in which users can obfuscate this data. With this proposal, we aim to improve user privacy while maintaining most of the existing uses of IP geolocation as a coarse location signal. Addressing pre-existing accuracy issues of IP geolocation is not a goal and generally, this proposal will inherit the prior limitations of IP as a source of location information.