message: [book] fix images
diff: @@ -21,7 +21,7 @@ $$\forall x \in \mathbb{F}, \; h_1(x)h_2(x) - h_3(x) = 0$$
  given commitments of $h_1, h_2, h_3$,
  -![maller 1](../../img/maller_1.png)
  +![maller 1](../img/maller_1.png)
  <!--
  //replace -\- with --:
  @@ -43,7 +43,7 @@ $$ \forall x \in \mathbb{F}, \; L(x) = h_1(s)h_2(x) - h_3(x) = 0$$
  given commitments of $h_1, h_2, h_3$ and evaluation of $h1$ at a point $s$.
  -![maller 2](../../img/maller_2.png)
  +![maller 2](../img/maller_2.png)
  <!--
  //replace -\- with --:
  @@ -68,7 +68,7 @@ $$L'(x) = h_1(x)h_2(x) - h_3(x)$$
  By doing
  -![maller 3](../../img/maller_3.png)
  +![maller 3](../img/maller_3.png)
  <!--
  ```sequence
  