Update the release notes of Thunderbird to 24.0.1

Signed-off-by: Carl X. Su <bcbcarl@gmail.com>
Apply CODE tags to TB 24.0 release notes

Signed-off-by: Carl X. Su <bcbcarl@gmail.com>
Merge pull request #11 from bcbcarl/master

Thunderbird 24.0.1 release notes