docs: remove empty line

PR-URL: #6979
Reviewed-by: Athan Reines <[email protected]>

Author: stdlib-bot

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

@@ -178,7 +178,6 @@ console.log( v );
 
 <!-- C usage documentation. -->
 
-
 <section class="usage">
 
 ### Usage