tree-wide: fix assorted typos all over the place

That is "success", "unknown", "through", "performance", "[re|un]mapping"
, "access", "default", "reasonable", "[con]currently", "temperature"
, "channel", "[un]used", "application", "example","hierarchy", "therefore"
, "[over|under]flow", "contiguous", "threshold", "enough" and others.

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/include/linux/serial_reg.h b/include/linux/serial_reg.h
index 850db2e..cf9327c 100644
--- a/include/linux/serial_reg.h
+++ b/include/linux/serial_reg.h
@@ -216,10 +216,10 @@
 
 #define UART_IIR_TOD	0x08	/* Character Timeout Indication Detected */
 
-#define UART_FCR_PXAR1	0x00	/* receive FIFO treshold = 1 */
-#define UART_FCR_PXAR8	0x40	/* receive FIFO treshold = 8 */
-#define UART_FCR_PXAR16	0x80	/* receive FIFO treshold = 16 */
-#define UART_FCR_PXAR32	0xc0	/* receive FIFO treshold = 32 */
+#define UART_FCR_PXAR1	0x00	/* receive FIFO threshold = 1 */
+#define UART_FCR_PXAR8	0x40	/* receive FIFO threshold = 8 */
+#define UART_FCR_PXAR16	0x80	/* receive FIFO threshold = 16 */
+#define UART_FCR_PXAR32	0xc0	/* receive FIFO threshold = 32 */