Update README.md

Fixed Indentation.

Author: uc-msft

samples/features/r-services/README.md

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 # Samples for SQL Server R Services
 
 Go to the getting started tutorials to learn more about:
-[Predictive Modeling with R Services](https://www.microsoft.com/en-us/sql-server/developer-get-started/rprediction) 
-[Customer Clustering with R Services](https://www.microsoft.com/en-us/sql-server/developer-get-started/rclustering) 
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+[Predictive Modeling with R Services](https://www.microsoft.com/en-us/sql-server/developer-get-started/rprediction)
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+[Customer Clustering with R Services](https://www.microsoft.com/en-us/sql-server/developer-get-started/rclustering)
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 [Telco Customer Churn](Telco Customer Churn)