Documentation/api/dap/README: add dlv dap usage link (#2957)
Documentation/api/dap/README: add dlv dap usage link (#2957)

Co-authored-by: Polina Sokolova <9669d32e64bb98a5c8a896ca295de24abd30e4bc@users.noreply.github.com>
go-delve/delve,go-delve/delve,go-delve/delve,go-delve/delve,go-delve/delve