fix typo in mount.go

Signed-off-by: Aaron.L.Xu <likexu@harmonycloud.cn>

api/types/mount/mount.go

@@ -83,7 +83,7 @@ type TmpfsOptions struct {
 	// Size sets the size of the tmpfs, in bytes.
 	//
 	// This will be converted to an operating system specific value
-	// depending on the host. For example, on linux, it will be convered to
+	// depending on the host. For example, on linux, it will be converted to
 	// use a 'k', 'm' or 'g' syntax. BSD, though not widely supported with
 	// docker, uses a straight byte value.
 	//