[gcr/mcatanzaro/iface] gcr: fix build with newest gi-docgen

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 2c4071302c2d2224b63766673bc5dd6853cde696
Author: Michael Catanzaro <mcatanzaro redhat com>
Date:   Mon Apr 4 11:45:26 2022 -0500

    gcr: fix build with newest gi-docgen
    
    WARNING: Invalid fragment for 'Gcr.Prompt': it should be iface
    The interface for implementing [class@Prompt].
                                   ^~~~~~~~~~~~~~

 gcr/gcr-prompt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gcr/gcr-prompt.c b/gcr/gcr-prompt.c
index 3c8ed2a..1cae21e 100644
--- a/gcr/gcr-prompt.c
+++ b/gcr/gcr-prompt.c
@@ -57,7 +57,7 @@
  * @prompt_confirm_finish: complete a confirm prompt
  * @prompt_close: close a prompt
  *
- * The interface for implementing [class@Prompt].
+ * The interface for implementing [iface@Prompt].
  */
 
 /**