loader: Fixed some types and comments

Change-Id: I66a5745a948c6677895950fdd48395afd5152ad7
diff --git a/loader/loader.h b/loader/loader.h
index ce78d4d..7485654 100644
--- a/loader/loader.h
+++ b/loader/loader.h
@@ -217,7 +217,7 @@
 #endif
 #ifdef VK_USE_PLATFORM_MIR_KHR
     PFN_vkGetPhysicalDeviceMirPresentationSupportKHR
-        GetPhysicalDeviceMirPresentvationSupportKHR;
+        GetPhysicalDeviceMirPresentationSupportKHR;
 #endif
 #ifdef VK_USE_PLATFORM_WAYLAND_KHR
     PFN_vkGetPhysicalDeviceWaylandPresentationSupportKHR