Use SOPS_EDITOR before EDITOR.

Converted from getsops/sops@5b7c45f

Signed-off-by: Felix Fontein <felix@fontein.de>

Author: felixfontein

content/en/docs/_index.md

@@ -113,8 +113,9 @@ please wait while an encryption key is being generated and stored in a secure fa
 file written to mynewtestfile.yaml
 ```
 
-Editing will happen in whatever `$EDITOR` is set to, or, if it\'s not
-set, in vim. Keep in mind that SOPS will wait for the editor to exit,
+Editing will happen in whatever `$SOPS_EDITOR` or `$EDITOR` is set to,
+or, if it's not set, in vim, nano, or vi.
+Keep in mind that SOPS will wait for the editor to exit,
 and then try to reencrypt the file. Some GUI editors (atom, sublime)
 spawn a child process and then exit immediately. They usually have an
 option to wait for the main editor window to be closed before exiting.