[coreboot-gerrit] Change in coreboot[master]: Documentation: Add binary extraction documentation

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Change subject: Documentation: Add binary extraction documentation
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Patch Set 4: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/57909/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13354/ : SUCCESS