chore : fix typo in chapter 1

[vinhyenvodoi98]

when I tried learning scilla I saw a couple of typo mistakes and fixed it.

[bb111189]

h @vinhyenvodoi98 ,

Thanks for your PR. The semi-colon (;) is necessary for statements separation. Only the final statement does not have a trailing ;
https://scilla.readthedocs.io/en/latest/scilla-in-depth.html#statements

[bb111189]

Semi-colon should not be removed

[vinhyenvodoi98]

@bb111189 oh i got it
I have returned the semicolon needed places

[bb111189]

Thanks alot . Do you mind if you create the PR to development instead.

[vinhyenvodoi98]

@bb111189 ok

[bb111189]

Thank you. We will be deploying it in a few tdays time to our production server.