Fix broken link (#370)

## Motivation and Context (Why the change? What's the scenario?)
Link to security filters is broken

## High level description (Approach, Design)
Fixes link to security filters when deployed to
https://microsoft.github.io/

Author: pascalberger

docs/FAQ.md

@@ -58,7 +58,7 @@ In order to protect users data, you should follow these design principles:
   this User ID
 * **Use Kernel Memory Tags as Security Filters**. Make sure every API call
   to Kernel Memory uses a User tag, both when reading and writing to memory.
-  See [Security Filters](SECURITY_FILTERS.md) for more details.
+  See [Security Filters](security/filters) for more details.
 
 ![Network diagram](network.png)
 
@@ -121,4 +121,4 @@ var answer2 = await memory.AskAsync("What's the total population?",
 
 If you have any question, please do not hesitate to
 [open a new issue](https://github.com/microsoft/kernel-memory/issues/new)
-in the Kernel Memory repository. Thanks!
+in the Kernel Memory repository. Thanks!