style: enable lint rule

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/stats/base/dnanmeanpw/README.md

@@ -45,8 +45,6 @@ The [arithmetic mean][arithmetic-mean] is defined as
 
 <section class="usage">
 
-<!-- lint disable maximum-heading-length -->
-
 ## Usage
 
 ```javascript