improve search help according suggestion
@@ -30,6 +30,7 @@ ${search-mode-rows
|-
You can combine searches with logical operators.
For example, to search all toml or rs files containing `tomat`, you may type `(${nr-prefix}toml/|${nr-prefix}rs$/)&${ce-prefix}tomat`.
+For efficiency, place content search last.
## Verbs
