There is a line missing in the diagram Figure 10.18 and Figure E.7

Hi Paul and Akira,

Our Chinese version editor Yunjing Li points out that there is a line
missing in Figure E.7, there should be 7, but Figure E.7 has only 6.

Similarly, I found there should be 6 lines in Figure 10.18, but
actually it has only 5.

Although I am very glad to fix the above possible bugs, fixing them is
beyond my capability.

Thanks, Zhouyi
Reported-by: Yunjing Li
Reported-by: Zhouyi Zhou <[email protected]>