build.7: Use proper .Dd date from this year

This commit is contained in:
Warner Losh 2021-03-25 01:48:12 -06:00
parent def657b825
commit 29dd5e7a87

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@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd March 25, 2020
.Dd March 25, 2021
.Dt BUILD 7
.Os
.Sh NAME