[gtksourceview] languagemanager: add since attribute to documentation

[Christian Hergert <chergert src gnome org>]

commit 407af3954ea0e3b0ea86046780ac20b0c4ae9805
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jan 28 11:22:59 2022 -0800

    languagemanager: add since attribute to documentation

 gtksourceview/gtksourcelanguagemanager.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gtksourceview/gtksourcelanguagemanager.c b/gtksourceview/gtksourcelanguagemanager.c
index 64983d27..d1dbb3c0 100644
--- a/gtksourceview/gtksourcelanguagemanager.c
+++ b/gtksourceview/gtksourcelanguagemanager.c
@@ -276,6 +276,8 @@ gtk_source_language_manager_set_search_path (GtkSourceLanguageManager *lm,
  * language files.
  *
  * See [method@LanguageManager.set_search_path] for details.
+ *
+ * Since: 5.4
  */
 void
 gtk_source_language_manager_append_search_path (GtkSourceLanguageManager *lm,
@@ -312,6 +314,8 @@ gtk_source_language_manager_append_search_path (GtkSourceLanguageManager *lm,
  * for language files.
  *
  * See [method@LanguageManager.set_search_path] for details.
+ *
+ * Since: 5.4
  */
 void
 gtk_source_language_manager_prepend_search_path (GtkSourceLanguageManager *lm,