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Description
Is your feature request related to a problem?
Related to #279.
In function module, we cannot write additional notes in the JSDocs generated from Vim/Neovim's documents because they'll be all replaced by the document generator (deno-denops-std/.scripts/gen-functions/gen-functions.ts).
Since such additional document sometimes beneficial, e.g., write a note about better helper function, difference in behavior between Vim's builtin functions and denops-std's ones or etc, it must be useful to add a mechanism to include additional document in the generated JSDocs for functions under deno-denops-std/function/*.
Describe the solution you'd like
Introduce a new marker or something to indicate the following statement/paragraph is an additional note so that it won't be removed through automatic JSDoc generations.