Update doc/specs/stdlib_math.md

MilanSkocic · perazz · web-flow · commit d909d26e3d0e · 2024-07-03T19:52:08.000+02:00
Co-authored-by: Federico Perini &lt;federico.perini@gmail.com&gt;
diff --git a/doc/specs/stdlib_math.md b/doc/specs/stdlib_math.md
@@ -422,7 +422,7 @@ Experimental
 
 Elemenal function.
 
-`rad2deg` converts the phase angle from radian to degree.
+`rad2deg` converts phase angles from radians to degrees.
 
 #### Syntax
 
