[pitivi] docs: Fix links

[Thibault Saunier <tsaunier src gnome org>]

commit 8745ccc59b4292e982774465d9432e881bb01486
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Sun Sep 2 22:53:42 2018 +0200

    docs: Fix links

 docs/Google_SoC_2007_-_Simple_Timeline.md | 2 +-
 docs/Past_GSoCs.md                        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/docs/Google_SoC_2007_-_Simple_Timeline.md b/docs/Google_SoC_2007_-_Simple_Timeline.md
index 94c6a802..bb77b2c3 100644
--- a/docs/Google_SoC_2007_-_Simple_Timeline.md
+++ b/docs/Google_SoC_2007_-_Simple_Timeline.md
@@ -8,7 +8,7 @@ my participation in Summer of Code.
 
 Our goal for this summer is to finish the Simple Timeline. I started by
 adding some of the features presented in the [Simple UI
-Mockups](Simple_UI_Mockups.md) illustrations. I am now turning
+Mockups](design/2007_design/2007_Simple_UI_Mockups.md) illustrations. I am now turning
 my attention to file load and save support, even though not all of the
 simple UI has been implemented. File Load/Save is now high priority. In
 addition, I have been creating [Design Docs](design.md) for
diff --git a/docs/Past_GSoCs.md b/docs/Past_GSoCs.md
index 6962083d..641f74dd 100644
--- a/docs/Past_GSoCs.md
+++ b/docs/Past_GSoCs.md
@@ -53,7 +53,7 @@ get involved.
 
 -   Anton Belka worked on the initial
     implementation of proxies in [GES](GES.md) (see [proxy
-    editing requirements](design/proxy_editing_requirements.md)).
+    editing requirements](design/Proxy_editing_requirements.md)).
 -   Joris Valette started work on slow/fast-motion in GStreamer.
 -   Mathieu Duponchelle worked on heavy
     bugfixing all across the Pitivi, [GES](GES.md) and GStreamer