fix: aregument typo in doc changed to argument (neovim#2195)

lua/lspconfig/server_configurations/pylsp.lua

@@ -25,7 +25,7 @@ A Python 3.6+ implementation of the Language Server Protocol.
 See the [project's README](https://github.com/python-lsp/python-lsp-server) for installation instructions.
 
 Configuration options are documented [here](https://github.com/python-lsp/python-lsp-server/blob/develop/CONFIGURATION.md).
-In order to configure an option, it must be translated to a nested Lua table and included in the `settings` aregument to the `setup{}` function.
+In order to configure an option, it must be translated to a nested Lua table and included in the `settings` argument to the `setup{}` function.
 For example, in order to set the `pylsp.plugins.pycodestyle.ignore` option:
 ```lua
 require'lspconfig'.pylsp.setup{