doc: Remove duplicate error entry

diff --git a/doc/voicecall-api.txt b/doc/voicecall-api.txt
index fb8f099..8db47ef 100644 (file)
--- a/doc/voicecall-api.txt
+++ b/doc/voicecall-api.txt
@@ -66,7 +66,6 @@ Methods               dict GetProperties()
                        Possible Errors: [service].Error.InProgress
                                         [service].Error.Failed
                                         [service].Error.NotImplemented
-                                        [service].Error.Failed
 
 Signals                PropertyChanged(string property, variant value)