Update docs/evaluation/tutorials/backtesting.mdx

Co-authored-by: Tanushree <87711021+tanushree-sharma@users.noreply.github.com>

docs/evaluation/tutorials/backtesting.mdx

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 Deploying your application is just the beginning of a continuous improvement process.
 Typically, you'll want to refine your system by enhancing prompts, language models, tools, and architectures.
 Backtesting involves assessing new versions of your application using historical data and comparing the new outputs to the original ones.
-This approach can offer a clearer indication of whether the new version is an improvement over the current deployment compared to evaluations using pre-production datasets.
+Compared to evaluations using pre-production datasets, backtesting offers a clearer indication of whether the new version of your application is an improvement over the current deployment. 
 
 Here are the basic steps for backtesting: