A number of small nitpicks changes to the temperature function examples

[edbennett]

This PR introduces a small number of related changes to the temperature examples for functions

1. Use temp_f rather than temp, to consistently identify that the input temperature for fahr_to_celsius is a temperature in Fahrenheit, since the return value will also be a temperature.
2. Use "kelvins" rather than "Kelvin"; since the kelvin is an SI unit, using lowercase and plural is correct.

[github-actions]

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⏱️ Updated at 2026-04-23 13:15:28 +0000