ref: add description that geo information is derived even if IP addre… (#13828)

This PR adds a description to tell users that the geo information is not
removed even if the "Prevent storing IP Addresses" toggle is enable and
also tells them which Advanced scrubbing rule should be used to properly
get rid of geo information in case it's desired.

Author: Litarnus

docs/security-legal-pii/scrubbing/server-side-scrubbing/index.mdx

@@ -36,7 +36,7 @@ Sentry will redact arrays and literal values, but also entire objects. For examp
 ```javascript
 credentials = {
   username: 'jane',
-  cats: ['pancake', 'maple', 'hellboy']
+  cats: ['pancake', 'maple', 'hellboy'],
   password: 'p4ssw0rd!',
   lastLogin: 'yesterday',
   ...
@@ -56,6 +56,13 @@ Only a select number of fields are scrubbed. You can find a list of the fields t
 
 In addition, we provide an [_Advanced Data Scrubbing_](/security-legal-pii/scrubbing//advanced-datascrubbing/) feature that allows more control over how filters are applied.
 
+## Geographic Information
+
+Geographic information is extracted from the user's IP address. This occurs even if the setting to stop storing IP addresses is turned on.
+
+To scrub geo data, it's necessary to add an [_Advanced Data Scrubbing_](/security-legal-pii/scrubbing//advanced-datascrubbing/) rule.
+For example, the rule `[Remove] [Anything] from [$user.geo.**]` will remove all geo information.
+
 ## Removing Data
 
 If you’ve accidentally sent sensitive data to the server, you likely don't to want to leave it there. There are a few things to note in removal: