Use reload instead of restart

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2415>

docs/administrator/installation/debian.md

@@ -364,10 +364,10 @@ $ sudo apt install nginx
    # ln -s /etc/nginx/sites-available/funkwhale.conf /etc/nginx/sites-enabled/
    ```
 
-6. Restart Nginx
+6. Reload Nginx
 
    ```console
-   # systemctl restart nginx
+   # systemctl reload nginx
    ```
 
 That's it! You've created your Nginx file.

docs/administrator/installation/docker.md

@@ -217,10 +217,10 @@ $ sudo apt install nginx
    # ln -s /etc/nginx/sites-available/funkwhale.conf /etc/nginx/sites-enabled/
    ```
 
-6. Restart Nginx
+6. Reload Nginx
 
    ```console
-   # systemctl restart nginx
+   # systemctl reload nginx
    ```
 
 That's it! You've created your Nginx file.

docs/administrator/upgrade/debian.md

@@ -42,10 +42,10 @@ To ensure your reverse proxy is up-to-date with changes, you should regenerate y
 :end-before: Instructions end
 :::
 
-Once you've updated your configuration, restart Nginx.
+Once you've updated your configuration, reload Nginx.
 
 ```console
-# systemctl restart nginx
+# systemctl reload nginx
 ```
 
 ## Update your Funkwhale instance

docs/administrator/upgrade/docker.md

@@ -71,10 +71,10 @@ To ensure your reverse proxy is up-to-date with changes, you should regenerate y
 :end-before: Instructions end
 :::
 
-Once you've updated your configuration, restart Nginx.
+Once you've updated your configuration, reload Nginx.
 
 ```console
-# systemctl restart nginx
+# systemctl reload nginx
 ```
 
 ## Upgrade the postgres container