Documentation: Add more keywords to descriptions of derive_param_computed() and derive_vars_computed()

[manciniedoardo]

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A user gave feedback that they were looking to implement a derived parameter that was a ratio of two other parameters and they searched for the keyword "ratio" in the website searchbar. This did not redirect them to derive_param_computed().

From a searchability perspective it could be beneficial to add a few of keywords to the description of these functions so that users may be redirected to them. Possible words:

• sum
• difference
• product/mutliplication
• division/ratio
• exponent(iation)
• logarithm

It's a little brute force-y but may be a quick and easy improvement.

[bms63]

I am going to save this for R/Pharma