It's just an example of what the manual looks like. i.e. it can be compared to the looks of an IKEA manual. They could probably have written LEGO-like, but went with a brand that is (more)known for their self-assembly manuals, that is without any words but clear illustrations.

To illustrate:
IKEA:

[![IKEA][1]][1]

Lego:

[![LEGO][2]][2]


  [1]: https://i.sstatic.net/7W9Gu.png
  [2]: https://i.sstatic.net/8x07n.png