fix(docs): Remove deprecated vim.lsp.with() from config docs

Neovim vim.lsp.with() is deprecated as of 0.11 [1].

Recommend another way to set update_in_insert

[1] https://neovim.io/doc/user/deprecated.html

Author: ianebeckett

plugin/vim/quick-lint-js.vim/doc/quick-lint-js.txt

@@ -205,17 +205,17 @@ module directly: >
     nvim_lsp.quick_lint_js.setup {}
 
 quick-lint-js is fast. To feel the speed, you might want to lint while in
-insert mode. Edit the "handlers" key in the setup function call to make
+insert mode. Edit the "on_attach" key in the setup function call to make
 JavaScript linting as fast as possible: >
 
     require('lspconfig/quick_lint_js').setup {
-      handlers = {
-        ['textDocument/publishDiagnostics'] = vim.lsp.with(
-          vim.lsp.diagnostic.on_publish_diagnostics, {
-            update_in_insert = true
-          }
-        )
-      }
+      on_attach = function(client, bufnr)
+          if client.name == "quick-lint-js" then
+              vim.diagnostic.config({
+                  update_in_insert = true,
+              }, client.id)
+          end
+      end,
     }
 
 The `setup` function can take the following configuration options: