Documentation: dontdiff: Add zstd compressed files

For now, that's arch/x86/boot/compressed/vmlinux.bin.zst but probably
more will come, thus let's be consistent with all other compressors.

Signed-off-by: Nick Terrell <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: terrelln

Documentation/dontdiff

@@ -55,6 +55,7 @@
 *.ver
 *.xml
 *.xz
+*.zst
 *_MODULES
 *_vga16.c
 *~