`LspCodeAction` only shows commands on the current line

I'm using clangd, and one of its feature is to show "Included header ... is not used directly (fixes available)" warning messages. However, `:LspCodeAction` only work when the cursor is on the line that contains the warning. Consider updating the README, which currently contains > Gets a list of possible commands that can be applied to **a file** so it can be fixed (quick fix) I think "the current line" is better match than "a file". Although I don't know if this is specific to `clangd`.