manpages: small formatting improvements

- use `.Os` to show "Void Linux" in the footer
- use `Aq Mt` to display email addresses
- use `.Lk` for the bug link
- remove unnecessary use of `.Nm <name>` when already defined
- add xbps-alternatives(1) to SEE ALSO where missing
- bump date

bin/xbps-dgraph/xbps-dgraph.1

@@ -1,10 +1,11 @@
-.Dd June 12, 2019
+.Dd Feb 9, 2023
 .Dt XBPS-DGRAPH 1
+.Os
 .Sh NAME
 .Nm xbps-dgraph
 .Nd XBPS utility to generate package dot(1) graphs
 .Sh SYNOPSIS
-.Nm xbps-dgraph
+.Nm
 .Op OPTIONS
 .Ar MODE
 .Ar PKG
@@ -122,6 +123,7 @@ Default package database (0.38 format). Keeps track of installed packages and pr
 Default cache directory to store downloaded binary packages.
 .El
 .Sh SEE ALSO
+.Xr xbps-alternatives 1 ,
 .Xr xbps-checkvers 1 ,
 .Xr xbps-create 1 ,
 .Xr xbps-digest 1 ,
@@ -132,14 +134,15 @@ Default cache directory to store downloaded binary packages.
 .Xr xbps-query 1 ,
 .Xr xbps-reconfigure 1 ,
 .Xr xbps-remove 1 ,
-.Xr xbps-rindex  1 ,
+.Xr xbps-rindex 1 ,
 .Xr xbps-uchroot 1 ,
 .Xr xbps-uunshare 1 ,
 .Xr xbps.d 5
 .Sh AUTHORS
-.An Juan Romero Pardines <xtraeme@gmail.com>
+.An Juan Romero Pardines Aq Mt xtraeme@gmail.com
 .Sh BUGS
 Probably, but I try to make this not happen. Use it under your own
 responsibility and enjoy your life.
 .Pp
-Report bugs at https://github.com/void-linux/xbps/issues
+Report bugs at
+.Lk https://github.com/void-linux/xbps/issues