double backticks on configuration directory list 1/2

Co-authored-by: Felix Fontein <felix@fontein.de>
Signed-off-by: Frederic R. <zougi.fr@gmail.com>

Author: fredericrous

README.rst

@@ -230,8 +230,8 @@ configuration directory.
 
 - **macOS**
 
-  - Looks for `keys.txt` in `$XDG_CONFIG_HOME/sops/age/keys.txt`;
-  - Falls back to `$HOME/Library/Application Support/sops/age/keys.txt`.
+  - Looks for ``keys.txt`` in ``$XDG_CONFIG_HOME/sops/age/keys.txt``;
+  - Falls back to ``$HOME/Library/Application Support/sops/age/keys.txt``.
 
 - **Windows**