[epiphany] Improve the manpage a bit

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 00549e4dace374c817f4eb6690a0a62df963baff
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Tue Jan 23 20:08:31 2018 -0600

    Improve the manpage a bit
    
    Indicate that -p starts a private instance, and try to make the
    documentation *slightly* less confusing. There's still lots of room for
    improvement; two application mode options aren't listed at all, for
    example.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=792841

 data/epiphany.1 |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/data/epiphany.1 b/data/epiphany.1
index bee76f4..1b835b9 100644
--- a/data/epiphany.1
+++ b/data/epiphany.1
@@ -1,7 +1,7 @@
 .\" Epiphany manpage.
 .\" Copyright © 2006 GNOME Foundation, Inc.
 .\"
-.TH EPIPHANY "1" "2016-10-14" "GNOME" ""
+.TH EPIPHANY "1" "2018-01-23" "GNOME" ""
 .SH NAME
 epiphany \- simple to use web browser for GNOME
 .SH SYNOPSIS
@@ -31,11 +31,11 @@ Load the given session file
 \fB\-t\fR, \fB\-\-add\-bookmark\fR=\fIURL\fR
 Add a bookmark
 .TP
-\fB\-\-private\-instance\fR
-Start a private instance
+\fB\-p\fR, \fB\-\-private\-instance\fR
+Start a private instance (temporary profile directory, not private browsing mode)
 .TP
 \fB\-\-incognito\-mode\fR
-Start an instance in incognito mode
+Start a private instance in incognito mode
 .TP
 \fB\-\-profile\fR=\fIFILE\fR
 Profile directory to use in the private instance