Fixed typo (#5439)

Changed it's (it is) to its
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Alvin Philips 2021-10-20 01:09:15 +05:30 committed by GitHub
parent 21cf3cc260
commit d32d0158a3
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@ -1,6 +1,6 @@
"""
Problem Description:
Given a binary tree, return it's mirror.
Given a binary tree, return its mirror.
"""