[evolution-data-server] Return back accidentally removed developer documentation for ESourceProxy

[Milan Crha <mcrha src gnome org>]

commit 0aeb67421d2698aaff57f6c3a9002f4cc3b577d9
Author: Milan Crha <mcrha redhat com>
Date:   Wed Jun 22 21:28:35 2022 +0200

    Return back accidentally removed developer documentation for ESourceProxy

 docs/reference/evolution-data-server/evolution-data-server-docs.sgml.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/docs/reference/evolution-data-server/evolution-data-server-docs.sgml.in 
b/docs/reference/evolution-data-server/evolution-data-server-docs.sgml.in
index f6e1e75e8..f2ec1e403 100644
--- a/docs/reference/evolution-data-server/evolution-data-server-docs.sgml.in
+++ b/docs/reference/evolution-data-server/evolution-data-server-docs.sgml.in
@@ -110,6 +110,7 @@
       <xi:include href="xml/e-source-mdn.xml"/>
       <xi:include href="xml/e-source-offline.xml"/>
       <xi:include href="xml/e-source-openpgp.xml"/>
+      <xi:include href="xml/e-source-proxy.xml"/>
       <xi:include href="xml/e-source-refresh.xml"/>
       <xi:include href="xml/e-source-resource.xml"/>
       <xi:include href="xml/e-source-revision-guards.xml"/>