Update README.md

README.md

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 <h1 style="text-align: center">MPT-7b-InstructAndStorywriting-75_25-Merge </h1>
-<h2 style="text-align: center">An merge between the long context Storywriting and the short context instruct MPT-7b models.</h2>
+<h2 style="text-align: center">A merge between the long context Storywriting and the short context instruct MPT-7b models.</h2>
 
 ## Model Details: