Example correction

src/Dmf_BusFilter.md

@@ -431,7 +431,7 @@ Any WDF context-allocation failure | Returned from `WdfObjectAllocateContext`.
 
 Parameter | Description
 ----|----
-BusFilterConfig | Pointer to a fully populated `DMF_BusFilter_CONFIG`. Initialize with `DMF_BusFilter_CONFIG_INIT` before setting callbacks. The caller retains ownership; the library copies the config internally.
+BusFilterConfig | Pointer to a fully populated `DMF_BusFilter_CONFIG`. Initialize with `DMF_BusFilter_CONFIG_INIT` before setting callbacks. The library copies the struct internally; the pointer does not need to remain valid after `DMF_BusFilter_Initialize` returns, so a stack-local variable in `DriverEntry` is sufficient.
 
 ##### Remarks
 
@@ -689,11 +689,6 @@ the filter. Release rules:
 The following sketch shows the minimum wiring for a client driver.
 
 ````c
-//
-// Global configuration block (or stored in driver context).
-//
-static DMF_BusFilter_CONFIG g_BusFilterConfig;
-
 //
 // Optional: per-child callback.
 //
@@ -767,12 +762,15 @@ DriverEntry(
     }
 
     // Initialize the bus filter library after WdfDriverCreate.
+    // The config struct can live on the stack: Initialize copies it internally
+    // and never reads the pointer again after it returns.
     //
-    DMF_BusFilter_CONFIG_INIT(&g_BusFilterConfig, DriverObject);
-    g_BusFilterConfig.EvtDeviceAdd    = MyDriver_EvtDeviceAdd;
-    g_BusFilterConfig.EvtDeviceRemove = MyDriver_EvtDeviceRemove;
+    DMF_BusFilter_CONFIG busFilterConfig;
+    DMF_BusFilter_CONFIG_INIT(&busFilterConfig, DriverObject);
+    busFilterConfig.EvtDeviceAdd    = MyDriver_EvtDeviceAdd;
+    busFilterConfig.EvtDeviceRemove = MyDriver_EvtDeviceRemove;
 
-    return DMF_BusFilter_Initialize(&g_BusFilterConfig);
+    return DMF_BusFilter_Initialize(&busFilterConfig);
 }
 ````