Documentation: mips/ingenic-tcu: eliminate duplicated word

Drop the doubled word "to".

Signed-off-by: Randy Dunlap <[e-mail]>
Reviewed-by: Paul Cercueil <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Cc: [e-mail]
Cc: Paul Cercueil <[e-mail]>
Cc: Thomas Bogendoerfer <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/mips/ingenic-tcu.rst

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 The Timer/Counter Unit (TCU) in Ingenic JZ47xx SoCs is a multi-function
-hardware block. It features up to to eight channels, that can be used as
+hardware block. It features up to eight channels, that can be used as
 counters, timers, or PWM.
 
 - JZ4725B, JZ4750, JZ4755 only have six TCU channels. The other SoCs all