useful headers added to previous news post

Signed-off-by: Leah Rowe <leah@libreboot.org>

site/news/update202308.md

@@ -8,6 +8,9 @@ eight weeks or so; could be sooner, or could be a bit later. ETA somewhere
 between late August to late September (perhaps early October) of this year; the
 most recent stable release of Libreboot came out on 25 June 2023.
 
+To receive these updates, you must use Git for now. See:
+[how to download Libreboot from Git](git.md)
+
 Introduction
 ============
 
@@ -69,6 +72,9 @@ I want to get as much testing done now as possible, ready for the next release,
 which will still be marked as a testing release anyway; the next stable release
 is a long way off, as much new work is planned for Libreboot.
 
+Apply to become a tester
+------------------------
+
 If you wish to provide such testing, please read the following page:
 
 [Apply to become board maintainer/tester for Libreboot](../docs/maintain/testing.html)
@@ -79,6 +85,15 @@ need to know. Coreboot tends to audit very carefully and updates are usually
 smooth, but testing is one of Libreboot's main purposes, to provide stable
 releases based on coreboot.
 
+How to download
+---------------
+
+To receive these updates, you must use Git for now. See:
+[how to download Libreboot from Git](git.md)
+
+Build from source
+-----------------
+
 This update, since it is not yet available pre-compiled in a release, must be
 compiled from source. See: