Fix language used in the r322923.

Pointed out by: wblock@
MFC after:      1 week
X-MFC-with:     r322923

UPDATING

@@ -66,8 +66,8 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 12.x IS SLOW:
 	soft-float everything else should be affected.
 
 20170826:
-       During boot the geli passphrase will be hidden. To restore previous
-       behavior see geli(8) configuration options.
+	The geli password typed at boot is now hidden.  To restore the previous
+	behavior, see geli(8) for configuration options.
 
 20170825:
 	Move PMTUD blackhole counters to TCPSTATS and remove them from bare

sbin/geom/class/eli/geli.8

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd August 26, 2017
+.Dd September 17, 2017
 .Dt GELI 8
 .Os
 .Sh NAME
@@ -280,8 +280,10 @@ To inhibit backups, you can use
 as the
 .Ar backupfile .
 .It Fl d
-While booting from this encrypted root filesystem enable visibility of
-passphrase length.
+When entering the passphrase to boot from this encrypted root filesystem, echo
+.Ql *
+characters.
+This makes the length of the passphrase visible.
 .It Fl e Ar ealgo
 Encryption algorithm to use.
 Currently supported algorithms are:
@@ -494,11 +496,14 @@ subcommand.
 .It Fl B
 Remove the BOOT flag from the given providers.
 .It Fl d
-While booting from this encrypted root filesystem enable visibility of
-passphrase length.
+When entering the passphrase to boot from this encrypted root filesystem, echo
+.Ql *
+characters.
+This makes the length of the passphrase visible.
 .It Fl D
-While booting from this encrypted root filesystem disable visibility of
-passphrase length.
+Disable echoing of any characters when a passphrase is entered to boot from this
+encrypted root filesystem.
+This hides the passphrase length.
 .It Fl g
 Enable booting from this encrypted root filesystem.
 The boot loader prompts for the passphrase and loads