kernel/vm_manager: Correct doxygen comment parameter tags for MapPhysicalMemory/UnmapPhysicalMemory

Corrects the parameter names within the doxygen comments so that they
resolve properly.

src/core/hle/kernel/vm_manager.h

@@ -454,7 +454,7 @@ public:
 
     /// Maps memory at a given address.
     ///
-    /// @param addr The virtual address to map memory at.
+    /// @param target The virtual address to map memory at.
     /// @param size   The amount of memory to map.
     ///
     /// @note The destination address must lie within the Map region.
@@ -468,7 +468,7 @@ public:
 
     /// Unmaps memory at a given address.
     ///
-    /// @param addr The virtual address to unmap memory at.
+    /// @param target The virtual address to unmap memory at.
     /// @param size   The amount of memory to unmap.
     ///
     /// @note The destination address must lie within the Map region.