[doc] Warn Marlin user that Linear Advance must be enabled in firmware to do the Pressure Advance/Linear Advance calibration #6111
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Description
After doing the pattern pressure advance calibration test, I saw that there was no difference in each line. After searching, it turns out that often the stock Marlin firmware does not have the pressure advance activated (as in my case for a stock Creality Ender 3 S1 Pro).
The linked Ellis' Print Tuning Guide does mention this, but in the introduction page, not in the pattern page.
I've also changed the notes and warning with github markdown alert to better highlight the reader about the warnings and notes.