function
boot.janet on line 3337, column 1
(doc-of x)
Searches all loaded modules in module/cache for a given binding and
prints out its documentation. This does a search by value instead
of by name. Returns nil.
(doc-of file/read) # => file/read docs are shown
(def tmpfile (file/temp))
(doc-of (tmpfile :read)) # => also shows the file/read docs.
# Note that we didn't have to use the file/read symbol here to get docs.