Enhance docstring for custom_equation

Updated docstring for custom_equation function.

Author: EgehanHatipoglu

Week04/functions_egehan_hatipoglu.py

@@ -5,9 +5,16 @@
 
 def custom_equation(x: int = 0, y: int = 0, /,
                     a: int = 1, b: int = 1, *, c: int = 1) -> float:
-
-
-
+    """
+    Calculate a mathematical equation.
+
+    :param x: First integer
+    :param y: Second integer
+    :param a: First exponent
+    :param b: Second exponent
+    :param c: Divisor
+    :return: Equation result
+    """
     return (x**a + y**b) / c