pass correct paths through to docstrings

[vtjnash]

fix #22105

[tkelman]

@mortenpi is there a test that could be added within base that would have caught the regression?

[mortenpi]

This would have caught it:

# issue #22105
module I22105
lineno = @__LINE__
"""
"""
function foo end
end

let foo_docs = meta(I22105)[@var(I22105.foo)].docs
    @test length(foo_docs) === 1
    @test isa(first(foo_docs), Pair)
    local docstr = first(foo_docs).second
    @test isa(docstr, DocStr)
    @test docstr.data[:path] == Base.source_path()
    @test docstr.data[:linenumber] == I22105.lineno + 1
    @test docstr.data[:module] === I22105
    @test docstr.data[:typesig] === Union{}
    @test docstr.data[:binding] == Binding(I22105, :foo)
end

Also, I can confirm that this fixes the issue.