docs: few changes for coherence

Author: andrepimpao

docs/03-rules_blank.md

@@ -31,7 +31,7 @@ type: `?callable` default: `null`
 
 Allows to define a `callable` that will be applied to the value before checking if it is valid.
 
-For example, use `trim`, or pass your own function, to not allow a string with whitespaces only:
+For example, use `trim`, or pass your own function, to allow a string with whitespaces only:
 
 ```php
 Validator::blank(normalizer: 'trim')->validate(' '); // true

docs/03-rules_not-blank.md

@@ -1,6 +1,6 @@
 # NotBlank
 
-Validates that a value is not equal to a blank string, blank array, `false` or `null`.
+Validates that a value is not equal to an empty string, empty array, `false` or `null`.
 
 Check the [Blank](03-rules_blank.md) rule for the opposite validation.