Fix auto_assign_org_role = Read Only Editor docs (#7057)

`auto_assign_org_role` should be `Read Only Editor` rather than `Read-Only Editor`

docs/sources/installation/configuration.md

@@ -248,7 +248,10 @@ organization to be created for that new user.
 
 
 The role new users will be assigned for the main organization (if the
 The role new users will be assigned for the main organization (if the
 above setting is set to true).  Defaults to `Viewer`, other valid
 above setting is set to true).  Defaults to `Viewer`, other valid
-options are `Admin` and `Editor` and `Read-Only Editor`.
+options are `Admin` and `Editor` and `Read Only Editor`. e.g. :
+
+`auto_assign_org_role = Read Only Editor`
+
 
 
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