docs: Update readme

Change-Id: I1e206235671ff507a51eca04b6ad4ba682dee2fd

Author: andeya

README.md

@@ -110,7 +110,7 @@ NOTE: **The `exprName` under the same struct field cannot be the same！**
 |`0` `0.0`|float64 "0"|
 |`''`|String|
 |`nil`|nil, undefined|
-|`!`|not, suitable for bool, string, float64, nil and $|
+|`!`|not, suitable for `bool`, `string`, `float64`, `nil`, `$` and `()`|
 |`+`|Digital addition or string splicing|
 |`-`|Digital subtraction or negative|
 |`*`|Digital multiplication|

validator/README.md

@@ -119,7 +119,7 @@ type T struct {
 |`0` `0.0`|float64 "0"|
 |`''`|String|
 |`nil`|nil, undefined|
-|`!`|not, suitable for bool, string, float64, nil and $|
+|`!`|not, suitable for `bool`, `string`, `float64`, `nil`, `$` and `()`|
 |`+`|Digital addition or string splicing|
 |`-`|Digital subtraction or negative|
 |`*`|Digital multiplication|