Update Perfrunbook location

Perfrunbook location changed in aws/aws-graviton-getting-started@a834d80

README.md

@@ -3,7 +3,7 @@
 A CLI tool to gather many pieces of performance data in one go. APerf includes a recorder and a reporter sub tool. The recorder gathers performance metrics, stores them in a set of local files that can then be analyzed via the reporter sub tool.
 
 ## Why does APerf exist?
-Performance issues in applications are investigated by recreating them locally and collecting data/metrics using monitoring tools like sysstat, perf, sysctl, ebpf, etc... or by running these tools remotely. Installing and executing various performance monitoring tools is a manual process and prone to errors. Even with the [Graviton Performance Runbook](https://github.com/aws/aws-graviton-getting-started/blob/main/perfrunbook/graviton_perfrunbook.md), understanding the output of these tools requires deep domain specific knowledge.
+Performance issues in applications are investigated by recreating them locally and collecting data/metrics using monitoring tools like sysstat, perf, sysctl, ebpf, etc... or by running these tools remotely. Installing and executing various performance monitoring tools is a manual process and prone to errors. Even with the [Graviton Performance Runbook](https://github.com/aws/aws-graviton-getting-started/blob/main/perfrunbook/README.md), understanding the output of these tools requires deep domain specific knowledge.
 
 The aim of APerf is to enable anyone to collect performance data in their environment while providing tools to analyze and visualize application performance. APerf will hopefully enable faster troubleshooting by analyzing and highlighting deviations in performance between two application environments automatically.