Various documentation suggests across a few domains.

Various documentation suggests across a few domains.

| domain | current | suggestion |
|--------|---------|------------|
| [GtkSeparator](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkseparator.c#L39)    | "`![An example GtkSeparator](separators.png)`" | "`![An example GtkSeparator](separator.png)`" [1] |
| [GtkTextBuffer](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtktextbuffer.c#L4885)  | "if there is an redoable action" | "if there is a redoable action" |
| [GtkTextBuffer/get_enable_undo](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtktextbuffer.c#L5005) | (Renders `No description available.`) | "Returns: %TRUE if undoing and redoing changes to the buffer is allowed." [3] |
| [GtkTextBuffer/get_max_undo_levels](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtktextbuffer.c#L5102) | (Renders `No description available.`)| "Returns: The max number of undo levels allowed (0 indicates unlimited)." |
| [GtkTextBuffer](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtktextbuffer.c#L3874) | "with gtk_text_buffer_add_selection_clipboard()." | "with [method@Gtk.TextBuffer.add_selection_clipboard]" |
| [GtkTextBuffer](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtktextbuffer.c#L3494) | "it will automatically toggled" | "it will automatically toggle" |

* [1] See : [separator.png](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/docs/reference/gtk/images/separator.png), [gtk4.toml.in](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/docs/reference/gtk/gtk4.toml.in#L218), [visual_index.md](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/docs/reference/gtk/visual_index.md?plain=1#L16)
* [2] Taken from `enable-undo` [property description](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtktextbuffer.c#L516)

* [GtkTextMark/gtk_text_mark_set_visible](https://docs.gtk.org/gtk4/method.TextMark.set_visible.html) is defined in [GtkTextMark's header](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtktextmark.h#L93), but implemented in [GtkTextBTree](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtktextbtree.c#L3036).
  * Other than being kind of confusing, this causes `gtk_text_mark_set_visible()`'s doc to not render where it expects it to.