[coreboot-gerrit] Change in coreboot[master]: Documentation: Add rules for writing Documentation

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Change subject: Documentation: Add rules for writing Documentation
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/74026/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/28138/ : SUCCESS