[coreboot-gerrit] Change in coreboot[master]: coreboot_tables: Document coreboot framebuffer

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Change subject: coreboot_tables: Document coreboot framebuffer
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Patch Set 3: Verified-1

Build Failed

https://qa.coreboot.org/job/coreboot-gerrit/66681/ : ABORTED

https://qa.coreboot.org/job/coreboot-checkpatch/21289/ : SUCCESS