docs: Fix list alignment of OpenMesh devices

Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>

docs/index.rst

@@ -133,15 +133,15 @@ ar71xx-generic
 
 * OpenMesh
 
- - MR1750
- - MR600 (v1, v2)
- - MR900 (v1, v2)
- - OM2P (v1, v2)
- - OM2P-HS (v1, v2)
- - OM2P-LC
- - OM5P
- - OM5P-AC (v1, v2)
- - OM5P-AN
+  - MR1750
+  - MR600 (v1, v2)
+  - MR900 (v1, v2)
+  - OM2P (v1, v2)
+  - OM2P-HS (v1, v2)
+  - OM2P-LC
+  - OM5P
+  - OM5P-AC (v1, v2)
+  - OM5P-AN
 
 * TP-Link