[gtksourceview] docs: misc improvements to the porting guide

[Sébastien Wilmet <swilmet src gnome org>]

commit caaf913d8ff7169b061ef7cea769c6838df34098
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Oct 28 14:01:51 2017 +0200

    docs: misc improvements to the porting guide
    
    Do not mention GtkSourceView 5 or GTK+ 4, because it's not yet done, and
    who knows, maybe GSV 5 will still depend on GTK+ 3, or there will never
    be a GSV 5 version if GSV goes completely unmaintained.

 docs/reference/porting-guide-3-to-4.xml |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)
---
diff --git a/docs/reference/porting-guide-3-to-4.xml b/docs/reference/porting-guide-3-to-4.xml
index 4e7d8e0..91ca9c8 100644
--- a/docs/reference/porting-guide-3-to-4.xml
+++ b/docs/reference/porting-guide-3-to-4.xml
@@ -13,18 +13,16 @@
   <refsect1>
     <title>GTK+ dependency</title>
     <para>
-      Both GtkSourceView 3 and GtkSourceView 4 depend on GTK+ 3. GtkSourceView 5
-      depends on GTK+ 4. Before porting an application to GTK+ 4, it is
-      therefore recommended to first port to GtkSourceView 4 and then to GTK+ 4
-      and GtkSourceView 5.
+      Both GtkSourceView 3 and GtkSourceView 4 depend on GTK+ 3.
     </para>
   </refsect1>
 
   <refsect1>
     <title>Preparation in GtkSourceView 3</title>
     <para>
-      GtkSourceView 3.24 is the latest stable GtkSourceView 3 version. You
-      should use this version without using any deprecated API.
+      GtkSourceView 3.24 is the latest stable GtkSourceView 3 version. Before
+      continuing this porting guide, you should use the 3.24 version without
+      using any deprecated API.
     </para>
   </refsect1>