[Feature] Add usage examples to standard library documentation

[Ph0enixKM]

Is your feature request related to a problem? Please describe.

Let's add usage examples to standard library functions. This will improve the readability and overall user experience of the documentation website.

Describe the solution you'd like

I suggest to implement @Mte90's idea to do it based of the test code.

[Mte90]

You can find the test code in the following path: src/tests/stdlib

[Mte90]

Ideally to me it should add links to the github version of the tests itself, in this way the documentation is not too much long.