BreakingChanges: say that `git diff X..Y` syntax will be removed in 3.0 #25054

Job	Run time
config	5s
fuzz smoke test	1m 35s
win+VS build	0s
static-analysis	5m 32s
win+Meson build	3m 43s
win build	5m 34s
sparse	4m 55s
osx-reftable (macos-13)	33m 21s
osx-clang (macos-13)	34m 16s
osx-meson (macos-13)	34m 5s
linux-meson (ubuntu:rolling)	13m 47s
linux32 (i386/ubuntu:focal)	9m 49s
osx-gcc (macos-13)	37m 3s
linux-sha256 (ubuntu:rolling)	13m 0s
linux-TEST-vars (ubuntu:20.04)	13m 19s
linux-breaking-changes (ubuntu:rolling)	12m 34s
almalinux-8 (almalinux:8)	9m 51s
linux-reftable-leaks (ubuntu:rolling)	34m 49s
linux-musl-meson (alpine:latest)	8m 3s
linux-reftable (ubuntu:rolling)	13m 6s
fedora-breaking-changes-meson (fedora:latest)	9m 40s
debian-11 (debian:11)	10m 11s
linux-leaks (ubuntu:rolling)	33m 37s
linux-asan-ubsan (ubuntu:rolling)	34m 7s
documentation	5m 31s
win+VS test	0s
win+Meson test	0s
win test (0)	6m 22s
win test (4)	10m 21s
win test (1)	9m 4s
win test (3)	7m 26s
win test (6)	6m 31s
win test (5)	8m 6s
win test (2)	6m 28s
win test (8)	11m 19s
win test (7)	6m 19s
win test (9)	7m 18s
	7h 40m 47s

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