Update README.md

Author: robbymeda

README.md

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 <h1> ParallelCluster post-install samples</h1>
-This repository gather some <a href=https://docs.aws.amazon.com/parallelcluster/latest/ug/what-is-aws-parallelcluster.html>**ParallelCluster**</a> post-install samples for common HPC-related operations.
+This repository gather some <a href=https://docs.aws.amazon.com/parallelcluster/latest/ug/what-is-aws-parallelcluster.html><b>ParallelCluster</b></a> post-install samples for common HPC-related operations.
 <br>Primary ParallelCluster script sets the environment and launches secondary scripts according to their naming convention.
 <br>All those scripts are meant to be stored on an S3 bucket. See more details in the Requirements section below.