Fix ruff linting errors in orbital_period

Author: MSameer404

physics/orbital_period.py

@@ -4,7 +4,7 @@
 
 T = 2π * sqrt((R + h)^3 / (G * M))
 
-G is the Universal Gravitational Constant and equals 6.674 × 10^-11 N m²/kg²
+G is the Universal Gravitational Constant and equals 6.674 X 10^-11 N m²/kg²
 M is the mass of the celestial body (kg)
 R is the radius of the celestial body (m)
 h is the height of the satellite above the surface (m)
@@ -52,4 +52,5 @@ def time_period_of_satellite(mass: float, radius: float, height: float) -> float
 if __name__ == "__main__":
     import doctest
 
-    doctest.testmod()
+    doctest.testmod()
+