[nvim] Add keybinding for LSP signature help.

.config/nvim/init.vim

@@ -67,6 +67,7 @@ local on_attach = function(client, bufnr)
     vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>lrr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
     vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>lca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
     vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>lqf', '<cmd>lua vim.lsp.buf.code_action({apply = true})<CR>', opts)
+    vim.api.nvim_buf_set_keymap(bufnr, 'i', '<C-h>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
 end
 
 -- Julia LSP (LanguageServer.jl)