Documentation/magic-number: Remove SCC_MAGIC

The SCC_MAGIC define was removed in commit 1ec3ba93c5fad9dc ("Staging:
remove drivers/char/scc.h as it should have gone a while ago"), while
its actual last user was removed before in commit bb2a97e9ccd525dd
("Staging: delete generic_serial drivers").

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --cc Documentation/magic-number.txt
Simple merge

diff --cc Documentation/zh_CN/magic-number.txt
Simple merge