fix(gen_vimfn_types): don't include tag before signature's line (#24492)

When signature is a bit long or there are too many tags, the tags appear
before the signature's line. Don't include the line with tags in the
previous function' docs.

Also fix lint warnings.

src/nvim/eval.lua

@@ -12,7 +12,7 @@
 --- @field func? string Name of the C function which implements the Vimscript function. Defaults to
 ---       `f_{funcname}`.
 --- @field fast? boolean Function can run in |api-fast| events. Defaults to false.
---- @field deprecated? string[]|true
+--- @field deprecated? string[]
 --- @field returns? string|false
 
 -- Usable with the base key: use the last function argument as the method base.