Tweaking docs.

Author: taylorotwell

validation.md

@@ -156,7 +156,7 @@ Below is a list of all available validation rules and their function:
 - [Date Format](#rule-date-format)
 - [Different](#rule-different)
 - [Digits](#rule-digits)
-- [Digits Between](#rule-digitsbetween)
+- [Digits Between](#rule-digits-between)
 - [E-Mail](#rule-email)
 - [Exists (Database)](#rule-exists)
 - [Image (File)](#rule-image)
@@ -244,8 +244,8 @@ The given _field_ must be different than the field under validation.
 
 The field under validation must be _numeric_ and must have an exact length of _value_.
 
-<a name="rule-digitsbetween"></a>
-#### digitsbetween:_min_,_max_
+<a name="rule-digits-between"></a>
+#### digits_between:_min_,_max_
 
 The field under validation must have a length between the given _min_ and _max_.