fix typo in contributor databse

snippets/bubble_sort.md

@@ -3,12 +3,12 @@ Bubble_sort uses the technique of comparing and swapping
 
 ```python
 def bubble_sort(arr):
-    for passnum in range(len(arr)-1,0,-1):
+    for passnum in range(len(arr) - 1, 0, -1):
         for i in range(passnum):
-            if arr[i]>arr[i+1]:
+            if arr[i] > arr[i + 1]:
                 temp = arr[i]
-                arr[i] = arr[i+1]
-                arr[i+1] = temp
+                arr[i] = arr[i + 1]
+                arr[i + 1] = temp
 
 ```
 

snippets/count_occurences.md

@@ -8,7 +8,7 @@ Uses the list comprehension to increment a counter each time you encounter the s
 
 ```python
 def count_occurrences(lst, val):
-	return len([x for x in lst if x == val and type(x) == type(val)])
+    return len([x for x in lst if x == val and type(x) == type(val)])
 ```
 
 ```python