[gmime] more doc fixes

[Jeffrey Stedfast <fejj src gnome org>]

commit 0df42f84a7840aa73d633644ee9c05ff880e76cd
Author: Jeffrey Stedfast <jestedfa microsoft com>
Date:   Fri Dec 9 16:09:38 2016 -0500

    more doc fixes

 docs/reference/gmime.hierarchy |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gmime.hierarchy b/docs/reference/gmime.hierarchy
index ed64b5e..f9a1b9c 100644
--- a/docs/reference/gmime.hierarchy
+++ b/docs/reference/gmime.hierarchy
@@ -15,6 +15,7 @@ GObject
   InternetAddressList
   GMimeCertificate
   GMimeCertificateList
+  GMimeDecryptResult
   GMimeSignature
   GMimeSignatureList
   GMimeCryptoContext