ARROW-13977: [Format] clarify leap seconds for interval type#11138

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houqp wants to merge 3 commits intomasterfrom qp_interval

+9-8

Commits on Sep 11, 2021

ARROW-13977 : [Format] clarify leap seconds and leap days for interval type
houqp
committed

Commits on Sep 17, 2021

remove mention of ordering and leap day
houqp
committed

Commits on Sep 21, 2021

use xx-bit notation consistently and specify integer type sign
houqp
committed