Update stdlib_math.md

MilanSkocic · jvdp1 · web-flow · commit 72927789ed8e · 2024-07-05T18:50:17.000+02:00
Co-authored-by: Jeremie Vandenplas &lt;jeremie.vandenplas@gmail.com&gt;
diff --git a/doc/specs/stdlib_math.md b/doc/specs/stdlib_math.md
@@ -424,6 +424,8 @@ Experimental
 
 Elemenal function.
 
+### Description
+
 `rad2deg` converts phase angles from radians to degrees.
 
 #### Syntax
