Docs: Fix 2.1.2 release notes build

Fix a document reference.

Change-Id: I4be1e2aab7f81db0e2b953cbd9261fc5e730fffc
Signed-off-by: Tomi Fontanilles <[email protected]>
(cherry picked from commit 771317e45ffc0a2c8213a81164ffde975417aa7d)

Author: tomi-font

docs/releases/2.1.2.rst

@@ -10,7 +10,7 @@ New features
 New platforms supported
 =======================
 
- - :doc:`MAX32657. </platform/adi/max32657readme>`
+- :doc:`MAX32657 </platform/adi/max32657/readme>`
 
 Hotfixes
 ========