fix(docs): Update env file for Unix socket

Added note to the CACHE_URL variable to clarify Unix socket usage

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2668>

api/config/settings/common.py

@@ -830,7 +830,7 @@ If you're using password auth (the extra slash is important)
 .. note::
 
     If you want to use Redis over unix sockets, you also need to update
-    :attr:`CELERY_BROKER_URL`, because the scheme differ from the one used by
+    :attr:`CELERY_BROKER_URL`, because the scheme differs from the one used by
     :attr:`CACHE_URL`.
 
 """
@@ -881,7 +881,7 @@ to use a different server or use Redis sockets to connect.
 
 Example:
 
-- ``redis://127.0.0.1:6379/0``
+- ``unix://127.0.0.1:6379/0``
 - ``redis+socket:///run/redis/redis.sock?virtual_host=0``
 
 """

deploy/env.prod.sample

@@ -99,7 +99,7 @@ REVERSE_PROXY_TYPE=nginx
 #
 # If you want to use Redis over unix sockets, you'll actually need two variables:
 # For the cache part:
-#  CACHE_URL=redis:///run/redis/redis.sock?db=0
+#  CACHE_URL=unix:///run/redis/redis.sock?db=0
 # For the Celery/asynchronous tasks part:
 #  CELERY_BROKER_URL=redis+socket:///run/redis/redis.sock?virtual_host=0