[devhelp] Improve Devhelp app general description

[Sébastien Wilmet <swilmet src gnome org>]

commit ed485c2788080e58d6c76089701cc72904576dce
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Thu Dec 21 18:35:59 2017 +0100

    Improve Devhelp app general description

 README       |   11 ++++++++---
 src/dh-app.c |    2 +-
 2 files changed, 9 insertions(+), 4 deletions(-)
---
diff --git a/README b/README
index 4b1ae1e..8b80b17 100644
--- a/README
+++ b/README
@@ -11,9 +11,14 @@ Dependencies:
 - webkit2gtk-4.0 >= 2.19.2
 - gsettings-desktop-schemas
 
-Devhelp's primary goal is to be an API documentation browser for
-GNOME. When you build (or install) a GNOME library, it will build an
-API reference for you and install it into:
+Devhelp is a developer tool for browsing and searching API documentation.
+
+Its primary goal is to well support GTK+ and GNOME libraries, but other
+development platforms can be supported, as long as the API documentation is
+available in HTML and a *.devhelp2 index file is generated.
+
+When you build (or install) a GNOME library, GTK-Doc will build an API
+reference for you and install it into:
 
   $datadir/gtk-doc/html/$PACKAGE. 
 
diff --git a/src/dh-app.c b/src/dh-app.c
index 800902f..56ac945 100644
--- a/src/dh-app.c
+++ b/src/dh-app.c
@@ -80,7 +80,7 @@ about_cb (GSimpleAction *action,
                                 */
                                "name", _("Devhelp"),
                                "version", PACKAGE_VERSION,
-                               "comments", _("A developers’ help browser for GNOME"),
+                               "comments", _("A developer tool for browsing and searching API 
documentation"),
                                "authors", authors,
                                "translator-credits", _("translator-credits"),
                                "website", PACKAGE_URL,