[coreboot-gerrit] Change in coreboot[master]: Documentation: Describe libgfxinit hook-up

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Change subject: Documentation: Describe libgfxinit hook-up
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Patch Set 2: Verified+1

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https://qa.coreboot.org/job/coreboot-checkpatch/6996/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/51025/ : SUCCESS