Documentation: mention vme_master_mmap() in VME API

Signed-off-by: Dmitry Kalinkin <[e-mail]>
Cc: Igor Alekseev <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/vme_api.txt

···
 the mask match with the values of the corresponding bits in the compare field,
 the value of swap is written the specified offset.
 
+Parts of a VME window can be mapped into user space memory using the following
+function:
+
+	int vme_master_mmap(struct vme_resource *resource,
+		struct vm_area_struct *vma)
+
 
 Slave windows
 =============