fix health check command for ZLS setup

Author: vieiralucas

content/zls/editors/vim/nvim-lspconfig.smd

@@ -118,7 +118,7 @@ EOF
 To make sure that ZLS is set up as expected, open a `.zig` file and run the following health checks:
 
 ```
-:checkhealth lspconfig vim.lsp
+:checkhealth vim.lsp
 ```
 
 For more information on the health check, refer to [Health check](https://neovim.io/doc/user/health).