New vacuum optoin.

doc/man/vacuum.l

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 .TH VACUUM SQL 11/05/95 Postgres95 Postgres95
 .SH NAME
 vacuum \(em vacuum a database
 .SH SYNOPSIS
 .nf
-\fBvacuum\fP
+\fBvacuum [table]\fP
 .fi
 .SH DESCRIPTION
 .BR Vacuum