[pitivi] docs: Fix the links to source files

[Thibault Saunier <tsaunier src gnome org>]

commit 09adb03b24214101e20867667fbec64f0c7bc594
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Sat Apr 14 22:56:25 2018 +0200

    docs: Fix the links to source files

 docs/release.md | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/docs/release.md b/docs/release.md
index 2b354897..36cb4253 100644
--- a/docs/release.md
+++ b/docs/release.md
@@ -33,18 +33,18 @@ Most of the steps below should be done in the [development environment](HACKING.
  <!-- * `$ make validate` FIXME! -->
 
 5. Update the following files:
-    * [meson.build](../meson.build):
+    * [meson.build](https://gitlab.gnome.org/GNOME/pitivi/blob/master/meson.build):
 If doing a bugfix release, add or increase the micro.
 If doing a regular release, bump YY up and remove the micro from
 the version number, for example: 0.97.1 -> 0.98. Normally this is the
 same as the name of the Phabricator milestone you just archived.
-     * [RELEASE](../RELEASE):
+     * [RELEASE](https://gitlab.gnome.org/GNOME/pitivi/blob/master/RELEASE):
 Update the short version of the release notes.
 To get the list of contributors: `$ git shortlog -s -n <previous-tag>..`
 To get the list of translators: `$ for i in po/*.po help/*; do echo $i; git shortlog -s <previous-tag>.. $i; 
done`
-     * [NEWS](../NEWS):
+     * [NEWS](https://gitlab.gnome.org/GNOME/pitivi/blob/master/NEWS):
 A shorter version of RELEASE, with the exec summary of changes.
-     * [AUTHORS](../AUTHORS):
+     * [AUTHORS](https://gitlab.gnome.org/GNOME/pitivi/blob/master/AUTHORS):
 If there are new maintainers.
 
 6. Commit the changes: `$ git commit -a -m "Release <version-number>"`
@@ -89,4 +89,4 @@ If there are new maintainers.
 
 11. On pitivi.org, update "releases.txt" for the app's update notification feature
 
-12. Bump the Z in the version number in [meson.build](../meson.build), for example if it was a regular 
release: 0.98 -> 0.98.1 or if it was a bug-fix release: 0.97.1 -> 0.97.2, and `$ commit -a -m "Back to 
development"`
+12. Bump the Z in the version number in 
[meson.build](https://gitlab.gnome.org/GNOME/pitivi/blob/master/meson.build), for example if it was a regular 
release: 0.98 -> 0.98.1 or if it was a bug-fix release: 0.97.1 -> 0.97.2, and `$ commit -a -m "Back to 
development"`