Fix simple typo: insided -> inside

Author: timgates42

patterns/creational/pool.py

@@ -15,7 +15,7 @@
 As we can see, the first string object put in "yam" is USED by the
 with statement. But because it is released back into the pool
 afterwards it is reused by the explicit call to sample_queue.get().
-Same thing happens with "sam", when the ObjectPool created insided the
+Same thing happens with "sam", when the ObjectPool created inside the
 function is deleted (by the GC) and the object is returned.
 
 *Where is the pattern used practically?