Removing excess whitespace.
diff --git a/samples/adexchangebuyer/README.md b/samples/adexchangebuyer/README.md
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 The DoubleClick Ad Exchange Buyer REST API samples are now hosted separately
 from the client library project. You can find them
 [here.](https://github.com/googleads/googleads-adxbuyer-examples/tree/master/python)
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