Fix programming guide TOC

Author: neon60

docs/sphinx/_toc.yml.in

@@ -37,7 +37,6 @@ subtrees:
     - entries:
       - file: how-to/hip_runtime_api/initialization
       - file: how-to/hip_runtime_api/memory_management
-      - file: how-to/hip_runtime_api/multi_device
         subtrees:
         - entries:
           - file: how-to/hip_runtime_api/memory_management/host_memory
@@ -53,6 +52,7 @@ subtrees:
       - file: how-to/hip_runtime_api/cooperative_groups
       - file: how-to/hip_runtime_api/hipgraph
       - file: how-to/hip_runtime_api/call_stack
+      - file: how-to/hip_runtime_api/multi_device
       - file: how-to/hip_runtime_api/external_interop
   - file: how-to/hip_porting_guide
   - file: how-to/hip_porting_driver_api