docs: add empty intro section

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---

Author: kgryte

lib/node_modules/@stdlib/blas/base/dger/README.md

@@ -22,6 +22,12 @@ limitations under the License.
 
 > Perform the rank 1 operation `A = α*x*y^T + A`.
 
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
 <section class="usage">
 
 ## Usage