objtool: update objtool.txt references
Changeset
a8e35fece49b ("objtool: Update documentation")
renamed: tools/objtool/Documentation/stack-validation.txt
to: tools/objtool/Documentation/objtool.txt.
Update the cross-references accordingly.
Fixes:
a8e35fece49b ("objtool: Update documentation")
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lore.kernel.org/r/ec285ece6348a5be191aebe45f78d06b3319056b.1656234456.git.mchehab@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>