[coreboot-gerrit] Change in coreboot[master]: Documentation/Intel: Add vboot documentation

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Change subject: Documentation/Intel: Add vboot documentation
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/53097/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/8931/ : SUCCESS