Updated linux/kernel/api/vfs_fallocate

linux/kernel/api/vfs_fallocate.md

@@ -1,4 +1,4 @@
-I don't know if this correct or not, but:
+I don't know if this correct or not, but here a manpage ugly draft:
 
 ```
 vfs_fallocate ( struct file *file, int mode, off_t offset, off_t len )