DOC: Duplicate Entry of Series.replace

[vikramaditya91]

Location of the

https://pandas.pydata.org/pandas-docs/stable/reference/series.html

Documentation problem

There are two entries of Series.replace. One in the Missing Data Handling and another one in Combining-Comparing-Joining-Merging

Suggested fix for documentation

Remove the entry from Combining, comparing, joining, merging