[Initiatives.wiki] Update Sandbox all the WebKit!

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 5f6afcf5b80c07c606b25864cf24ef8eddbbc7a3
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Tue Jun 16 20:42:46 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 1e6d00e..8e4fcaa 100644
--- a/Sandbox-all-the-WebKit!.md
+++ b/Sandbox-all-the-WebKit!.md
@@ -1,6 +1,7 @@
  * Adjust your meson.build to depend on WebKitGTK 2.26.0.
  * 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.
+ * 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. You will need 
to either mount the directory containing the desired file inside the sandbox, or rearchitect the application. 
[Example.](https://gitlab.gnome.org/GNOME/epiphany/-/commit/a2b73274280efa067632ec0dfedb3fcc7a41f8fe) Note 
that most applications only load files via the UI process using webkit_web_view_load_url(); such loads will 
work fine because they are managed by the unsandboxed network process, so whitelisting is not required.
  * [Example](https://gitlab.gnome.org/GNOME/gnome-initial-setup/-/merge_requests/87/diffs)
  * [Tracking issue](https://gitlab.gnome.org/GNOME/Initiatives/-/issues/19)
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