man: make tpm2_clear.1.md similar to other .md files
man: make tpm2_clear.1.md similar to other .md files

For unknown reasons, the previous commiter of this file decided
to use an out of date presentation for this markdown file and
not to follow the exemples given by the other .1.md files.

Change this to use the presentation used in the other similar files.

Signed-off-by: Emmanuel Deloget <55525e1b3dfd8787fd202aed45fb04494e3242d0@free.fr>

01org/tpm2.0-tools,01org/tpm2.0-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,01org/tpm2.0-tools