Update stdlib_math.fypp

Co-authored-by: Jeremie Vandenplas <jeremie.vandenplas@gmail.com>

Author: MilanSkocic

src/stdlib_math.fypp

@@ -474,7 +474,7 @@ contains
     #:endfor
 
     #:for k1, t1 in REAL_KINDS_TYPES
-    elemental function deg2rad_${k1}$(theta)result(result)
+    elemental function deg2rad_${k1}$(theta) result(result)
         ${t1}$, intent(in) :: theta
         ${t1}$ :: result
         result = theta * PI_${k1}$ / 180.0_${k1}$