docs: fix missing closing comment

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---

Author: kgryte

lib/node_modules/@stdlib/stats/base/dists/normal/mgf/README.md

@@ -146,6 +146,8 @@ logEachMap( 't: %0.4f, µ: %0.4f, σ: %0.4f, M_X(t;µ,σ): %0.4f', t, mu, sigma,
 
 </section>
 
+<!-- /.examples -->
+
 <!-- C interface documentation. -->
 
 * * *