Support multi-line text in @field and @param comments

[Nicolas Lebedenco]

This is a feature request to support multi-line text in @field and @param comments.
For example:

--- @param myparam string A very long description
---                       that requires multiple lines

This is in line with a similar feature request in EmmyLua (EmmyLua/IntelliJ-EmmyLua#363)