[doc] Debian capitalisation

docs/installation/external_dependencies.rst

@@ -14,7 +14,7 @@ Funkwhale requires a PostgreSQL database to work properly. Please refer
 to the `PostgreSQL documentation <https://www.postgresql.org/download/>`_
 for installation instructions specific to your os.
 
-On debian-like systems, you would install the database server like this:
+On Debian-like systems, you would install the database server like this:
 
 .. code-block:: shell
 
@@ -68,7 +68,7 @@ Funkwhale also requires a cache server:
   queries
 - To handle asynchronous tasks such as music import
 
-On debian-like distributions, a redis package is available, and you can
+On Debian-like distributions, a redis package is available, and you can
 install it:
 
 .. code-block:: shell

docs/installation/index.rst

@@ -101,7 +101,7 @@ In order to make funkwhale accessible from outside your server and to play nicel
 Nginx
 ^^^^^
 
-Ensure you have a recent version of nginx on your server. On debian-like system, you would have to run the following:
+Ensure you have a recent version of nginx on your server. On Debian-like system, you would have to run the following:
 
 .. code-block:: bash