`handler` doc generate imporve

[attila-lin]

Description of the feature

Currently, the handler macro will convert a function to a struct, which is hard to be observed in cargo doc.

Maybe, we can add some highlight the struct like handler(path for web::Path, query for web::Query, I think they are maybe hard to impl) in the doc at the front of description.

Code example (if possible)

In the doc page.

# Struct

hello_world              [`handler`] the description

with a feature like doc ?

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This issue was closed because it has been stalled for 5 days with no activity.