message: document vPMU support (II)
diff: **Q3:** Does PCM work inside a virtual machine?
  -**A3:** PCM works inside virtual machines which support vPMU providing a limited set of metrics supported by vPMU. For example on AWS instances this is indicated by the presence of [arch_perfmon](https://instaguide.io/info.html?type=c5.18xlarge) flag: https://instaguide.io/ . Enabling vPMU in hypervisors is documented [in Hardware Event-Based Sampling section](https://software.intel.com/content/www/us/en/develop/documentation/vtune-help/top/set-up-analysis-target/on-virtual-machine.html).
  +**A3:** PCM works inside virtual machines which support vPMU (with a limited set of metrics supported by vPMU). For example on AWS instances this is indicated by the presence of [arch_perfmon](https://instaguide.io/info.html?type=c5.18xlarge) flag: https://instaguide.io/ . Enabling vPMU in hypervisors is documented [in Hardware Event-Based Sampling section](https://software.intel.com/content/www/us/en/develop/documentation/vtune-help/top/set-up-analysis-target/on-virtual-machine.html).
  **Q4:** Does PCM work inside a docker container?
  