Improve docs for the Installer Script #413

Job	Run time
build (MarlinFirmware/Marlin, Marlin, Marlin, mega2560, ubuntu-latest)	1m 1s
build (MarlinFirmware/Marlin, Marlin, Marlin, mega2560, windows-latest)	5m 15s
build (MarlinFirmware/Marlin, Marlin, Marlin, mega2560, macos-latest)	1m 28s
build (esphome/esphome, esphome, esphome, esp32-arduino, ubuntu-latest)	9m 47s
build (esphome/esphome, esphome, esphome, esp32-arduino, macos-latest)	14m 51s
build (scottbez1/smartknob, smartknob, smartknob, view, ubuntu-latest)	2m 9s
build (scottbez1/smartknob, smartknob, smartknob, view, windows-latest)	3m 31s
build (scottbez1/smartknob, smartknob, smartknob, view, macos-latest)	2m 15s
build (xoseperez/espurna, espurna, espurna/code, nodemcu-lolin, ubuntu-latest)	3m 46s
build (xoseperez/espurna, espurna, espurna/code, nodemcu-lolin, windows-latest)	5m 13s
build (xoseperez/espurna, espurna, espurna/code, nodemcu-lolin, macos-latest)	4m 7s
build (1technophile/OpenMQTTGateway, OpenMQTTGateway, OpenMQTTGateway, esp32-m5atom-lite, ubuntu-...	3m 17s
build (1technophile/OpenMQTTGateway, OpenMQTTGateway, OpenMQTTGateway, esp32-m5atom-lite, windows...	6m 22s
build (1technophile/OpenMQTTGateway, OpenMQTTGateway, OpenMQTTGateway, esp32-m5atom-lite, macos-l...	3m 37s
	1h 6m 39s

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