FreeBSD_HEAD_amd64_gcc - Build #1718 - Fixed

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FreeBSD_HEAD_amd64_gcc - Build #1718 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_amd64_gcc/1718/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_amd64_gcc/1718/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_amd64_gcc/1718/console

Change summaries:

308799 by dexuan:
fix share/man/man4/Makefile for hv_ata_pci_disengage.4

We need to remove the line since we removed the related manual just now.

Reviewed by:	sephe
Approved by:	sephe (mentor)
MFC after:	1 week
Sponsored by:	Microsoft