reset echo:start back to start and default monitor_speed back to 250000#20326

Merged

thinkyhead merged 3 commits intoMarlinFirmware:bugfix-2.0.xfrom ellensp:bugfix-2.0.x-#20305

Dec 3, 2020

+2-2

Commits on Nov 30, 2020

change echo:start back to start

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update default monitor_speed back to 250000

ellensp
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Commits on Dec 1, 2020

use SERIAL_ECHOLNPGM

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