Add guide to enter_accept config (#57)

I hated the default `enter` key behavior but changing it is so obscure
in the long list of config. Let's add it to the key binding page as this
is where I think most people will look it up.

---------

Co-authored-by: Ellie Huxtable <[email protected]>

src/content/docs/configuration/key-binding.mdx

@@ -49,6 +49,10 @@ eval "$(atuin init zsh)"
 
 You can then choose to bind Atuin if needed, do this after the call to init.
 
+## Enter key behavior
+
+By default, the `enter` key will directly execute the selected comamnd instead of letting you edit it like the `tab` key. If you want to change this behavior, set `enter_accept = false` in your config. For more details: [enter_accept](https://docs.atuin.sh/configuration/config/#enter_accept).
+
 ## <kbd>Ctrl-n</kbd> key shortcuts
 
 macOS does not have an <kbd>Alt</kbd> key, although terminal emulators can often be configured to map the <kbd>Option</kbd> key to be used as <kbd>Alt</kbd>. *However*, remapping <kbd>Option</kbd> this way may prevent typing some characters, such as using <kbd>Option-3</kbd> to type `#` on the British English layout. For such a scenario, set the `ctrl_n_shortcuts` option to `true` in your config file to replace <kbd>Alt-0</kbd> to <kbd>Alt-9</kbd> shortcuts with <kbd>Ctrl-0</kbd> to <kbd>Ctrl-9</kbd> instead: