fix(readme): Corrected link for headers in geolocation.md file

[hakiour]

Updated the link in the geolocation.md file to fix a typo and ensure proper navigation. Previously, the link cookies/headers(../../../glossary/concepts/http_headers.md) was incorrectly formatted. The link has been corrected to (../../../glossary/concepts/http_cookies.md)/headers to properly direct readers to the relevant sections on cookies and headers in the HTTP glossary.