Fix typo in "Managing User Configuraton" (#167)

Found a little typo!

Author: Kai Cataldo

src/content/docs/configuration/manage_user_config.mdx

@@ -6,7 +6,7 @@ sidebar_position: 1
 
 import { Tabs, TabItem, Steps } from "@astrojs/starlight/components";
 
-AstroNvim is installed with the `lazy.nvim` plugin manager just like any other plugin in Neovim. The template provided in the installation instructions is simply a minimal Neovim configuration with the lazy.nvim plugin manager that adds AstroNvim along with some example code. This makes it easy to back the configuration the configuration to a git repository.
+AstroNvim is installed with the `lazy.nvim` plugin manager just like any other plugin in Neovim. The template provided in the installation instructions is simply a minimal Neovim configuration with the lazy.nvim plugin manager that adds AstroNvim along with some example code. This makes it easy to back the configuration up to a git repository.
 
 ## Setting up a user configuration