[recharts] Use lowercase .md suffix (#45951)

This is the only file in the whole DT repo with an uppercase name, and
I'm making it easier to have markdown edits based on a (case-sensitive)
suffix.
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Eli Barzilay 2020-07-08 12:40:23 -04:00 committed by GitHub
parent 6078bfee54
commit ce234ea339
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