[glib/string-ctors] Annotate the GString constructors

[Emmanuele Bassi <ebassi src gnome org>]

commit d5b6c55cfeb8381433ea665503bb1a95fdf68255
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Aug 16 20:58:53 2021 +0100

    Annotate the GString constructors
    
    Otherwise the introspection scanner won't recognise them as
    constructors, because the GString get_type function has a different
    symbol prefix.
    
    See: https://gitlab.gnome.org/GNOME/gobject-introspection/-/issues/399

 glib/gstring.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)
---
diff --git a/glib/gstring.c b/glib/gstring.c
index da9c5f7ab..a400d4f24 100644
--- a/glib/gstring.c
+++ b/glib/gstring.c
@@ -104,16 +104,15 @@ g_string_maybe_expand (GString *string,
 }
 
 /**
- * g_string_sized_new:
- * @dfl_size: the default size of the space allocated to
- *     hold the string
+ * g_string_sized_new: (constructor)
+ * @dfl_size: the default size of the space allocated to hold the string
  *
  * Creates a new #GString, with enough space for @dfl_size
  * bytes. This is useful if you are going to add a lot of
  * text to the string and don't want it to be reallocated
  * too often.
  *
- * Returns: the new #GString
+ * Returns: (transfer full): the new #GString
  */
 GString *
 g_string_sized_new (gsize dfl_size)
@@ -131,13 +130,13 @@ g_string_sized_new (gsize dfl_size)
 }
 
 /**
- * g_string_new:
+ * g_string_new: (constructor)
  * @init: (nullable): the initial text to copy into the string, or %NULL to
- * start with an empty string
+ *   start with an empty string
  *
  * Creates a new #GString, initialized with the given string.
  *
- * Returns: the new #GString
+ * Returns: (transfer full): the new #GString
  */
 GString *
 g_string_new (const gchar *init)
@@ -160,7 +159,7 @@ g_string_new (const gchar *init)
 }
 
 /**
- * g_string_new_len:
+ * g_string_new_len: (constructor)
  * @init: initial contents of the string
  * @len: length of @init to use
  *
@@ -172,7 +171,7 @@ g_string_new (const gchar *init)
  * responsibility to ensure that @init has at least @len addressable
  * bytes.
  *
- * Returns: a new #GString
+ * Returns: (transfer full): a new #GString
  */
 GString *
 g_string_new_len (const gchar *init,