[gtksourceview] Doc: move important paragraph in a note

[SÃbastien Wilmet <swilmet src gnome org>]

commit 71105e132bfcf1307df15c3744f95a84597983e4
Author: SÃbastien Wilmet <swilmet gnome org>
Date:   Sat Jan 12 22:30:53 2013 +0100

    Doc: move important paragraph in a note
    
    It's more visible like that.

 gtksourceview/gtksourcecompletionprovider.c |   19 ++++++++++++++-----
 1 files changed, 14 insertions(+), 5 deletions(-)
---
diff --git a/gtksourceview/gtksourcecompletionprovider.c b/gtksourceview/gtksourcecompletionprovider.c
index d8b85d4..2531d8a 100644
--- a/gtksourceview/gtksourcecompletionprovider.c
+++ b/gtksourceview/gtksourcecompletionprovider.c
@@ -27,7 +27,6 @@
  * @short_description: Completion provider interface
  *
  * You must implement this interface to provide proposals to #GtkSourceCompletion
- *
  */
 
 #include "gtksourcecompletionprovider.h"
@@ -234,13 +233,18 @@ gtk_source_completion_provider_match (GtkSourceCompletionProvider *provider,
  * This allows for customized widgets on a proposal basis, although in general
  * providers will have the same custom widget for all their proposals and
  * @proposal can be ignored. The implementation of this function is optional.
- * If implemented, gtk_source_completion_provider_update_info() MUST also be
- * implemented.
  *
  * If this function is not implemented, the default widget is a #GtkLabel. The
  * return value of gtk_source_completion_proposal_get_info() is used as the
  * content of the #GtkLabel.
  *
+ * <note>
+ *   <para>
+ *     If implemented, gtk_source_completion_provider_update_info()
+ *     <emphasis>must</emphasis> also be implemented.
+ *   </para>
+ * </note>
+ *
  * Returns: (transfer none): a custom #GtkWidget to show extra
  * information about @proposal.
  */
@@ -261,8 +265,13 @@ gtk_source_completion_provider_get_info_widget (GtkSourceCompletionProvider *pro
  * @info: a #GtkSourceCompletionInfo.
  *
  * Update extra information shown in @info for @proposal.
- * This function MUST be implemented when
- * #gtk_source_completion_provider_get_info_widget is implemented.
+ *
+ * <note>
+ *   <para>
+ *     This function <emphasis>must</emphasis> be implemented when
+ *     gtk_source_completion_provider_get_info_widget() is implemented.
+ *   </para>
+ * </note>
  */
 void
 gtk_source_completion_provider_update_info (GtkSourceCompletionProvider *provider,