Update MarkerClusterer.md to not use index as key #748
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Updated MarkerClusterer.md to not use the index as a key. There is an eslint rule for this
https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-array-index-key.md.
The clustering will not work properly on updates unless you use a key such as maybe the latitude + longitude. I spent a lot of time trying to figure out why the updates were not creating the clusters properly.