gtk: Fix various tiny typos in documentation comments

e.g. Invalid syntax in introspection annotations, typos in object names,
accidentally using a gtk-doc comment for an internal function.

gtk/gtkcssstyleproperty.c

@@ -401,7 +401,7 @@ _gtk_css_style_property_get_initial_value (GtkCssStyleProperty *property)
  * Computes a bitmask for all properties that have at least one of @flags
  * set.
  *
- * Returns: (transfer: full): A #GtkBitmask with the bit set for every
+ * Returns: (transfer full): A #GtkBitmask with the bit set for every
  *          property that has at least one of @flags set.
  */
 GtkBitmask *

gtk/gtklistbox.c

@@ -3338,7 +3338,7 @@ gtk_list_box_update_row_styles (GtkListBox *box)
 
 /**
  * gtk_list_box_row_set_activatable:
- * @row: a #GTkListBoxrow
+ * @row: a #GtkListBoxRow
  * @activatable: %TRUE to mark the row as activatable
  *
  * Set the #GtkListBoxRow:activatable property for this row.

gtk/gtklistbox.h

@@ -172,6 +172,7 @@ typedef void (*GtkListBoxUpdateHeaderFunc) (GtkListBoxRow *row,
 /**
  * GtkListBoxCreateWidgetFunc:
  * @item: the item from the model for which to create a widget for
+ * @user_data: (closure): user data
  *
  * Called for list boxes that are bound to a #GListModel with
  * gtk_list_box_bind_model() for each item that gets added to the model.

gtk/gtkmodelbutton.c

@@ -42,7 +42,7 @@
  *
  * GtkModelButton is a button class that can use a #GAction as its model.
  * In contrast to #GtkToggleButton or #GtkRadioButton, which can also
- * be backed by a #Gaction via the #GtkActionable:action-name property,
+ * be backed by a #GAction via the #GtkActionable:action-name property,
  * GtkModelButton will adapt its appearance according to the kind of
  * action it is backed by, and appear either as a plain, check or
  * radio button.

gtk/gtksettings.c

@@ -922,7 +922,7 @@ gtk_settings_class_init (GtkSettingsClass *class)
   g_assert (result == PROP_ERROR_BELL);
 
   /**
-   * GtkSettings:color-hash: (element-type utf8 Gdk.Color):
+   * GtkSettings:color-hash: (element-type utf8 Gdk.Color)
    *
    * Holds a hash table representation of the #GtkSettings:gtk-color-scheme
    * setting, mapping color names to #GdkColors.

gtk/gtkwin32.c

@@ -75,7 +75,7 @@ find_first_manifest (HMODULE  module_handle,
   return TRUE;
 }
 
-/**
+/*
  * Grabs the first manifest it finds in libgtk3 (which is expected to be the
  * common-controls-6.0.0.0 manifest we embedded to enable visual styles),
  * uses it to create a process-default activation context, activates that