Update prime-factors.md

snippets/python/s/prime-factors.md

@@ -14,15 +14,15 @@ Finds and returns the list of prime factors of a number.
 
 ```py
 def prime_factors(num):
-    factors = []
-    factor = 2
-    while (num >= 2):
-        if (num % factor == 0):
-            factors.append(factor)
-            num = num / factor
-        else:
-            factor += 1
-    return factors
+  factors = []
+  factor = 2
+  while (num >= 2):
+    if (num % factor == 0):
+      factors.append(factor)
+      num = num / factor
+    else:
+      factor += 1
+  return factors
 ```
 
 ```py