message: Fix misleading README in grafana scripts
diff: @@ -3,8 +3,9 @@ Instructions on How To Run PCM Grafana Dashboard
  --------------------------------------------------------------------------------
  Installation on target system to be analyzed:
  -1. Build:
  +1. Build from the root PCM directory:
  ```
  + cd ../.. # if the current location is 'scripts/grafana/'
  mkdir build && cd build
  cmake .. && make -j$(nproc) pcm-sensor-server
  ```
  