Documentation📄: Explain about the standard modules supported by FLINT

[Namyalg]

What is the current documentation state?

The page https://docs.moja.global/en/latest/Understanding-FLINT/moja-flint/modules.html lists the various standard modules the FLINT consists of. There is no explanation given for the 6 modules stated.
The wiki page, https://github.com/moja-global/FLINT/wiki/3.4-Module-Science provides a simple explanation about these modules. Providing a link to this wiki page will help users understand more about the different modules