Update abs.mdx

Clarify abs() reference explanation

Author: iamniky

src/content/reference/en/p5/abs.mdx

@@ -4,7 +4,7 @@ module: Math
 submodule: Calculation
 file: src/math/calculation.js
 description: >
-  <p>Calculates the absolute value of a number.</p>
+  <p>Returns the absolute value of a number.</p>
 
   <p>A number's absolute value is its distance from zero on the number line.