Always use `,` as a function parameters separator in the docs

[sequba]

Description

Although the separator for function parameters can be configured, , is the default separator and it should be used consistently in our docs.

We use ; instead of ',' in:

• https://handsontable.github.io/hyperformula/guide/built-in-functions.html#math-and-trigonometry
• https://handsontable.com/blog/articles/2021/8/8-examples-of-useful-excel-functions-in-hyperformula
• ...?

Links

https://handsoncode.slack.com/archives/C031GBX62SE/p1653572684792079 (internal discussion)