[Initiatives.wiki] Update Sandbox all the WebKit!

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a77855efde58a54ecb99e789c7b7b3eb478a0925
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Tue Jun 16 20:30:19 2020 +0000

    Update Sandbox all the WebKit!

 Sandbox-all-the-WebKit!.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/Sandbox-all-the-WebKit!.md b/Sandbox-all-the-WebKit!.md
index c2eae6e..1e6d00e 100644
--- a/Sandbox-all-the-WebKit!.md
+++ b/Sandbox-all-the-WebKit!.md
@@ -2,4 +2,5 @@
  * If your application creates its own `WebKitWebContext`, call `webkit_web_context_set_sandbox_enabled()` 
on it.
  * If your application does not create its own `WebKitWebContext`, then it uses the default web context. Use 
`webkit_web_context_get_default()` and call `webkit_web_context_set_sandbox_enabled()` on it.
  * Perform a basic functionality test to sanity-check that the sandbox has not broken major app 
functionality. The vast majority of applications should not notice any issues. Applications that attempt to 
access file:/// URIs from a web process extension will break.
- * [Example](https://gitlab.gnome.org/GNOME/gnome-initial-setup/-/merge_requests/87/diffs)
\ No newline at end of file
+ * [Example](https://gitlab.gnome.org/GNOME/gnome-initial-setup/-/merge_requests/87/diffs)
+ * [Tracking issue](https://gitlab.gnome.org/GNOME/Initiatives/-/issues/19)
\ No newline at end of file