doc: Update PDF documentation Zephyr logo

This commit replaces the Zephyr logo for the PDF documentations with
the new registered trademark version.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit is contained in:
Stephanos Ioannidis 2022-05-28 11:49:41 +09:00
commit 62770eb9c0

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