Two corrections and added method linking that show up in docs

Two corrections and added method linking that show up in docs

| method                                                                                          | current                                                    | suggestion                                                |
|-------------------------------------------------------------------------------------------------|------------------------------------------------------------|-----------------------------------------------------------|
| [Entry/set_invisible_char](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkentry.c#L2101) | "(attributes org.gtk.Method.sets_property=invisible-char)" | "(attributes org.gtk.Method.set_property=invisible-char)" |
| [FlowBox::activate](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkflowbox.c#L541)       | "This can be happen either by"                             | "This can happen either by"                               |

| method                                                                                                    | current                                                | suggestion                                                   |
|-----------------------------------------------------------------------------------------------------------|--------------------------------------------------------|--------------------------------------------------------------|
| [Box/get_baseline_position](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkbox.c#L461)             | "value set by gtk_box_set_baseline_position()."        | "value set by [method@Gtk.Box.set_baseline_position]."       |
| [Box/get_spacing](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkbox.c#L412)                       | "value set by gtk_box_set_spacing()."                  | "value set by [method@Gtk.Box.set_spacing]."                 |
| [CenterBox/get_baseline_position](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkcenterbox.c#L528) | "value set by gtk_center_box_set_baseline_position()." | "value set by [method@Gtk.CenterBox.set_baseline_position]." |
| [Entry/get_activates_default](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkentry.c#L2296)        | "value set by gtk_entry_set_activates_default()."      | "value set by [method@Gtk.Entry.set_activates_default]."     |
| [Entry/get_alignment](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkentry.c#L2380)                | "value set by gtk_entry_set_alignment()."              | "value set by [method@Gtk.Entry.set_alignment]."             |
| [Entry/get_extra_menu](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkentry.c#L3727)               | "set with gtk_entry_set_extra_menu()."                 | "set with [method@Gtk.Entry.set_extra_menu]."                |
| [Entry/get_has_frame](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkentry.c#L2340)                | "value set by gtk_entry_set_has_frame()."              | "value set by [method@Gtk.Entry.set_has_frame]."             |
| [Entry/get_progress_pulse_step](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkentry.c#L3372)      | "set with gtk_entry_set_progress_pulse_step()."        | "set with [method@Gtk.Entry.set_progress_pulse_step]."       |
| [Fixed/get_child_transform](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkfixed.c#L314)           | "set using gtk_fixed_set_child_transform()."           | "set using [method@Gtk.Fixed.set_child_transform]."          |