doc: Add missing table end

Required for adding new content.

Fixes: 6626dc8fd4 ("doc: Add supported distros (kernel, libc, toolchain)")

Signed-off-by: Petr Vorel <pvorel@suse.cz>
diff --git a/doc/supported-kernel-libc-versions.txt b/doc/supported-kernel-libc-versions.txt
index 2b5b9da..e48e3ae 100644
--- a/doc/supported-kernel-libc-versions.txt
+++ b/doc/supported-kernel-libc-versions.txt
@@ -64,3 +64,4 @@
                                  https://github.com/linux-test-project/ltp/blob/master/ci/alpine.sh[CI script]
                                  for list of files which need to be deleted in order to compile under musl).
 | binder (Android) | Please use https://android.googlesource.com/platform/external/ltp/[AOSP fork].
+|==================================