That sounds pretty much as a standard contract as I know them (and I've seen a few :-). A contract normally states function, salary, working hours, holiday and starting period. Not much more. It is not really common to put anything in the contract that isn't better than the Code of Obligation. Not even this is necessary as it can equally well be regulated through an employee handbook or even an oral agreement.

There really isn't much need to do it in any other way as anything contractually agreed can be changed by the employer as long as the statutory notice period is kept.

You may want to ask though if there is an employee handbook that you can have a look at before you sign. And of course, try to find out as much about Swiss Employment Law as you can before you sign. This site is a great source for that :-)