Request Parameters section has a mistake when Lua is used as the documentation language

[rokf]

The @params object is a concatenation of all the default loaded parameters listed above. URL parameters have the highest precedence, followed by body parameters, then query parameters. This means that an :id URL parameters will not be overwritten by an ?id= query parameter.

The @params here should probably be replaced with params or self.params.

Source: https://leafo.net/lapis/reference/actions.html

[rokf]

I've included the fix in leafo/lapis#769