docs: Add copyright statement to toml template

I missed adding the statement so I added them here to prevent others from
forgetting to add the statement.

BUG=None
TEST=Documentation change only

Change-Id: I2d75baede4820a8a294d08ce7d1c1c28b355cfbd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/bazel/+/5999878
Reviewed-by: Matt Stark <msta@google.com>
Tested-by: John L Chen <zuan@chromium.org>
Commit-Queue: John L Chen <zuan@chromium.org>
1 file changed