[evolution-data-server] Correct few annotations in developer comments

[Milan Crha <mcrha src gnome org>]

commit a54c4caa693ceb411833314453fa51fb6a3ebade
Author: Milan Crha <mcrha redhat com>
Date:   Mon Aug 27 10:25:45 2018 +0200

    Correct few annotations in developer comments

 src/libedataserver/e-source-webdav.c   | 2 +-
 src/libedataserver/e-webdav-discover.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/libedataserver/e-source-webdav.c b/src/libedataserver/e-source-webdav.c
index 67804f524..1f12215ac 100644
--- a/src/libedataserver/e-source-webdav.c
+++ b/src/libedataserver/e-source-webdav.c
@@ -863,7 +863,7 @@ e_source_webdav_dup_color (ESourceWebdav *extension)
 /**
  * e_source_webdav_set_color:
  * @extension: an #ESourceWebdav
- * @color: (optional): the color of the WebDAV resource, or %NULL
+ * @color: (nullable): the color of the WebDAV resource, or %NULL
  *
  * Updates the last known color of a WebDAV resource, as provided by the server.
  *
diff --git a/src/libedataserver/e-webdav-discover.c b/src/libedataserver/e-webdav-discover.c
index 3e7b48522..dd3378d3d 100644
--- a/src/libedataserver/e-webdav-discover.c
+++ b/src/libedataserver/e-webdav-discover.c
@@ -510,7 +510,7 @@ e_webdav_discover_sources (ESource *source,
  * @url_use_path: (nullable): optional URL override, or %NULL
  * @only_supports: bit-or of EWebDAVDiscoverSupports, to limit what type of sources to search
  * @credentials: (nullable): credentials to use for authentication to the server
- * @ref_source_func: (nullable): optional callback to use to get an ESource
+ * @ref_source_func: (nullable) (scope async): optional callback to use to get an ESource
  * @ref_source_func_user_data: (nullable): user data for @ref_source_func
  * @cancellable: optional #GCancellable object, or %NULL
  * @callback: (scope async): a #GAsyncReadyCallback to call when the request
@@ -714,7 +714,7 @@ e_webdav_discover_sources_sync (ESource *source,
  * @url_use_path: (nullable): optional URL override, or %NULL
  * @only_supports: bit-or of EWebDAVDiscoverSupports, to limit what type of sources to search
  * @credentials: (nullable): credentials to use for authentication to the server
- * @ref_source_func: (nullable): optional callback to use to get an ESource
+ * @ref_source_func: (nullable) (scope call): optional callback to use to get an ESource
  * @ref_source_func_user_data: (nullable): user data for @ref_source_func
  * @out_certificate_pem: (out) (nullable): optional return location
  *   for a server SSL certificate in PEM format, when the operation failed