Edit on line no. 153. Replaced fn add_to_waitlist with fn eat_at_restaurant.

[thedumbsloth]

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Chapter 7.3 - Paths for referring to an item in the module-tree

The adding of pub keyword to mod hosting and fn add_to_waitlist enables us to use the absolute and relative paths in the "fn eat_at_restaurant" instead of fn add_to_waitlist according to the code specified in listing 7-7.