regmap: fix duplicated word in <linux/regmap.h>

Change doubled word "be" to "to be".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/7ef41bfc-de3e-073a-8746-0b3fdf7628c0@infradead.orgSigned-off-by: Mark Brown <broonie@kernel.org>

include/linux/regmap.h

@@ -275,7 +275,7 @@ typedef void (*regmap_unlock)(void *);
  *			readable if it belongs to one of the ranges specified
  *			by rd_noinc_table).
  * @disable_locking: This regmap is either protected by external means or
- *                   is guaranteed not be be accessed from multiple threads.
+ *                   is guaranteed not to be accessed from multiple threads.
  *                   Don't use any locking mechanisms.
  * @lock:	  Optional lock callback (overrides regmap's default lock
  *		  function, based on spinlock or mutex).