Fix wget in linux update guide (#2858)

* change link from wget to curl in linux update guid #2857

* change back to wget per feedback  #2857

docs/en/admins/07_LinuxUpdate.md

@@ -67,7 +67,7 @@ cd /usr/share/FreshRSS/
 
 3. Download and unzip the update file
 ```
-wget -o freshrss.zip https://github.com/FreshRSS/FreshRSS/archive/1.15.3.zip
+wget -O freshrss.zip https://github.com/FreshRSS/FreshRSS/archive/1.15.3.zip
 unzip freshrss.zip
 ```