[fix] update pizza pi instructions for excersise number one

Currently the instructions are misleading. The description says that for every person that is served, 45g of dough are added. The example below calculates with 20g. As a result the corresponding test fails because the expected amount of dough is only true with 20g per person.

I am not seeing the “example below” or anywhere.

Did you forget to complete the example in this message?

I meant the example in the instructions. Sorry for beeing inconcrete.

The problem got fixed in the meantime. I created a pull request but the Github bot closed it immediately and told me to put the topic in here. Thankfully the creator of the excercise opened the pull request again and merged it.