[coreboot-gerrit] Change in coreboot[master]: Documentation: Create Lesson2.md

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Change subject: Documentation: Create Lesson2.md
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Patch Set 4: Verified+1

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https://qa.coreboot.org/job/coreboot-gerrit/57890/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13336/ : SUCCESS