docs: add equations for math/base/special/airy

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---

Author: rreusser

lib/node_modules/@stdlib/math/base/special/airy/README.md

@@ -32,6 +32,11 @@ The [Airy functions of the first and second kind][airy-functions] are the linear
 \frac{d^2y}{dx^2} - xy = 0.
 ```
 
+<!-- <div class="equation" align="center" data-raw-text="\frac{d^2y}{dx^2} - xy = 0." data-equation="eq:airy_equation">
+    <img src="" alt="Airy equation">
+    <br>
+</div> -->
+
 <!-- </equation> -->
 
 </section>