docs: add aggregator _get_type functions for signals + properties

https://bugzilla.gnome.org/show_bug.cgi?id=775379
diff --git a/docs/libs/Makefile.am b/docs/libs/Makefile.am
index 7919d66..f294bd0 100644
--- a/docs/libs/Makefile.am
+++ b/docs/libs/Makefile.am
@@ -57,6 +57,9 @@
 # contains GtkObjects/GObjects and you want to document signals and properties.
 GTKDOC_CFLAGS = -DGST_USE_UNSTABLE_API $(GST_PLUGINS_BAD_CFLAGS) $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS)
 GTKDOC_LIBS = \
+	$(top_builddir)/gst-libs/gst/base/libgstbadbase-@GST_API_VERSION@.la \
+	$(top_builddir)/gst-libs/gst/audio/libgstbadaudio-@GST_API_VERSION@.la \
+	$(top_builddir)/gst-libs/gst/video/libgstbadvideo-@GST_API_VERSION@.la \
 	$(top_builddir)/gst-libs/gst/codecparsers/libgstcodecparsers-@GST_API_VERSION@.la \
 	$(top_builddir)/gst-libs/gst/gl/libgstgl-@GST_API_VERSION@.la \
 	$(top_builddir)/gst-libs/gst/insertbin/libgstinsertbin-@GST_API_VERSION@.la \
diff --git a/docs/libs/gst-plugins-bad-libs.types b/docs/libs/gst-plugins-bad-libs.types
index 69b3c39..ff31ee9 100644
--- a/docs/libs/gst-plugins-bad-libs.types
+++ b/docs/libs/gst-plugins-bad-libs.types
@@ -1,5 +1,8 @@
 #include <gst/gst.h>
 
+#include <gst/base/gstaggregator.h>
+#include <gst/audio/gstaudioaggregator.h>
+#include <gst/video/gstvideoaggregator.h>
 #include <gst/codecparsers/gsth264parser.h>
 #include <gst/codecparsers/gstmpegvideoparser.h>
 #include <gst/insertbin/gstinsertbin.h>
@@ -7,6 +10,15 @@
 #include <gst/gl/gl.h>
 #include <gst/player/player.h>
 
+gst_aggregator_get_type
+gst_aggregator_pad_get_type
+
+gst_audio_aggregator_get_type
+gst_audio_aggregator_pad_get_type
+
+gst_video_aggregator_get_type
+gst_video_aggregator_pad_get_type
+
 gst_mpegts_section_get_type
 gst_mpegts_section_type_get_type
 gst_mpegts_section_table_id_get_type