blog: fix incorrect inner link

Signed-off-by: David Dal Busco <david.dalbusco@outlook.com>

Author: peterpeterparker

blog/2025-09-04-passkeys-authentication-is-here/index.md

@@ -182,7 +182,7 @@ Check out the updated documentation for details on:
 - [signUp](/docs/build/authentication/development#sign-up)
 - [signIn](/docs/build/authentication/development#sign-in)
 - [signOut](/docs/build/authentication/development#sign-out)
-- [onAuthStateChange](/docs/build/authentication/development#onAuthStateChange)
+- [onAuthStateChange](/docs/build/authentication/development#listening-to-auth-changes)
 
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