docs: Its just GTK now

Another round of + removal.

gdk/gdkgl.c

@@ -298,7 +298,7 @@ gdk_gl_texture_quads (GdkGLContext *paint_context,
  * @width: The width of the region to draw
  * @height: The height of the region to draw
  *
- * This is the main way to draw GL content in GTK+. It takes a render buffer ID 
+ * This is the main way to draw GL content in GTK. It takes a render buffer ID 
  * (@source_type == #GL_RENDERBUFFER) or a texture id (@source_type == #GL_TEXTURE)
  * and draws it onto @cr with an OVER operation, respecting the current clip.
  * The top left corner of the rectangle specified by @x, @y, @width and @height

gdk/gdkseat.c

@@ -264,7 +264,7 @@ gdk_seat_get_capabilities (GdkSeat *seat)
  * commonly.
  *
  * Grabs are used for operations which need complete control over the
- * events corresponding to the given capabilities. For example in GTK+ this
+ * events corresponding to the given capabilities. For example in GTK this
  * is used for Drag and Drop operations, popup menus and such.
  *
  * Note that if the event mask of a #GdkSurface has selected both button press
@@ -350,7 +350,7 @@ gdk_seat_get_slaves (GdkSeat             *seat,
  * Returns the master device that routes pointer events.
  *
  * Returns: (transfer none) (nullable): a master #GdkDevice with pointer
- *          capabilities. This object is owned by GTK+ and must not be freed.
+ *          capabilities. This object is owned by GTK and must not be freed.
  **/
 GdkDevice *
 gdk_seat_get_pointer (GdkSeat *seat)
@@ -370,7 +370,7 @@ gdk_seat_get_pointer (GdkSeat *seat)
  * Returns the master device that routes keyboard events.
  *
  * Returns: (transfer none) (nullable): a master #GdkDevice with keyboard
- *          capabilities. This object is owned by GTK+ and must not be freed.
+ *          capabilities. This object is owned by GTK and must not be freed.
  **/
 GdkDevice *
 gdk_seat_get_keyboard (GdkSeat *seat)
@@ -405,7 +405,7 @@ gdk_seat_device_removed (GdkSeat   *seat,
  *
  * Returns the #GdkDisplay this seat belongs to.
  *
- * Returns: (transfer none): a #GdkDisplay. This object is owned by GTK+
+ * Returns: (transfer none): a #GdkDisplay. This object is owned by GTK
  *          and must not be freed.
  **/
 GdkDisplay *

gdk/gdktypes.h

@@ -200,7 +200,7 @@ typedef enum
  * @GDK_HYPER_MASK: the Hyper modifier
  * @GDK_META_MASK: the Meta modifier
  * @GDK_MODIFIER_RESERVED_29_MASK: A reserved bit flag; do not use in your own code
- * @GDK_RELEASE_MASK: not used in GDK itself. GTK+ uses it to differentiate
+ * @GDK_RELEASE_MASK: not used in GDK itself. GTK uses it to differentiate
  *  between (keyval, modifiers) pairs from key press and release events.
  * @GDK_MODIFIER_MASK: a mask covering all modifier types.
  *
@@ -454,7 +454,7 @@ typedef enum {
  * GdkSurfaceTypeHint:
  * @GDK_SURFACE_TYPE_HINT_NORMAL: Normal toplevel window.
  * @GDK_SURFACE_TYPE_HINT_DIALOG: Dialog window.
- * @GDK_SURFACE_TYPE_HINT_MENU: Window used to implement a menu; GTK+ uses
+ * @GDK_SURFACE_TYPE_HINT_MENU: Window used to implement a menu; GTK uses
  *  this hint only for torn-off menus, see #GtkTearoffMenuItem.
  * @GDK_SURFACE_TYPE_HINT_TOOLBAR: Window used to implement toolbars.
  * @GDK_SURFACE_TYPE_HINT_SPLASHSCREEN: Window used to display a splash
@@ -514,7 +514,7 @@ typedef enum
  *
  * An enumeration describing the way in which a device
  * axis (valuator) maps onto the predefined valuator
- * types that GTK+ understands.
+ * types that GTK understands.
  *
  * Note that the X and Y axes are not really needed; pointer devices
  * report their location via the x/y members of events regardless. Whether

gdk/gdkversionmacros.h.in

@@ -37,7 +37,7 @@
  *
  * A macro that should be defined before including the gdk.h header.
  * If it is defined, no compiler warnings will be produced for uses
- * of deprecated GDK and GTK+ APIs.
+ * of deprecated GDK and GTK APIs.
  */
 
 #ifdef GDK_DISABLE_DEPRECATION_WARNINGS