Update 9.3-to-9.4.md

doc/update/9.3-to-9.4.md

@@ -157,8 +157,7 @@ configuration file may contain syntax errors. The block name
 file, should be `[[storage]]` instead.
 
 ```shell
-cd /home/git/gitaly
-sudo -u git -H editor config.toml
+sudo -u git -H sed -i.pre-9.4 's/\[\[storages\]\]/[[storage]]/' /home/git/gitaly/config.toml
 ```
 
 #### Compile Gitaly