adjust some docs

docs/hfcs.1

@@ -75,6 +75,9 @@ Specifically, an argument
 .Ql re
 will be automatically rewritten as
 .Ql \\\b(?i:re)\\\b .
+.Pp
+An optional expiration may be specified as a duration.
+XdYhZm for X days, Y hours, and Z minutes.
 .Sh SEE ALSO
 .Xr honk 1
 .Sh CAVEATS

docs/intro.1

@@ -26,16 +26,16 @@ This is the index for the honk manual.
 .Bl -tag -width activitypubxxr
 .It Xr honk 1
 User manual.
-.It Xr hfcs 1
-Honk Filtering and Censorsing System.
+.It Xr honk 8
+Administration manual.
 .It Xr honk 5
 Honk composition.
+.It Xr hfcs 1
+Honk Filtering and Censorship System.
 .It Xr activitypub 7
 ActivityPub implementation notes.
-.It Xr honk 8
-Administration manual.
 .El
 .Sh HISTORY
 Started March 2019.
 .Sh AUTHORS
-.An Ted Unangst Lk @tedu@honk.tedunangst.com https://honk.tedunangst.com/u/tedu
+.An Ted Unangst Lk https://honk.tedunangst.com/u/tedu @tedu@honk.tedunangst.com