[gtk/ebassi/gidocgen] builder: Tweak docs

[Matthias Clasen <matthiasc src gnome org>]

commit 57e4967acba49cb16491f30d9971d80042d09d6b
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Mar 1 01:31:41 2021 -0500

    builder: Tweak docs

 gtk/gtkbuildable.h | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/gtk/gtkbuildable.h b/gtk/gtkbuildable.h
index 5527337b19..d1b5ba04e6 100644
--- a/gtk/gtkbuildable.h
+++ b/gtk/gtkbuildable.h
@@ -39,6 +39,12 @@ typedef struct _GtkBuildableIface GtkBuildableIface;
 typedef struct _GtkBuildableParseContext      GtkBuildableParseContext;
 typedef struct _GtkBuildableParser GtkBuildableParser;
 
+/**
+ * GtkBuildableParseContext:
+ *
+ * An opaque context struct for `GtkBuildableParser`.
+ */
+
 /**
  * GtkBuildableParser:
  * @start_element: function called for open elements