[PATCH] docs: release-technician-checklist: update to leaf tree version pinning

[Jan Beulich <jbeulich@xxxxxxxx>]

Our releases look to flip-flop between keeping or discarding the date
and title of the referenced qemu-trad commit. I think with the hash
replaced by a tag, the commit's date and title would better also be
purged.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
I've been noticing this inconsistency repeatedly because I simply re-use
version update patches for the stable trees - the context mismatch
results in a such updated patch to then not apply, due to said flip-
flopping. For 4.15 I'm inclined to drop the two offending lines perhaps
while updating the version to 4.15.1-pre.

--- a/docs/process/release-technician-checklist.txt
+++ b/docs/process/release-technician-checklist.txt
@@ -53,6 +53,7 @@
 #   QEMU_UPSTREAM_REVISION,
 #   QEMU_TRADITIONAL_REVISION
 #   MINIOS_UPSTREAM_REVISION
+#     (drop any references to the specific commits, e.g. date or title)
 * change SUPPORT.md heading version number; -unstable or -rc tag
 *     (empty in stable branches after .0 release).
 * SUPPORT.md: insert correct version number in release-notes link