dt-bindings: i2c: fix typo 'can by' to 'can be'

Signed-off-by: Wolfram Sang <[e-mail]>
Signed-off-by: Wolfram Sang <[e-mail]>

Documentation/devicetree/bindings/i2c/i2c-davinci.txt

···
 - clock-frequency : desired I2C bus clock frequency in Hz.
 - ti,has-pfunc: boolean; if defined, it indicates that SoC supports PFUNC
 	registers. PFUNC registers allow to switch I2C pins to function as
-	GPIOs, so they can by toggled manually.
+	GPIOs, so they can be toggled manually.
 
 Example (enbw_cmc board):
 	i2c@1c22000 {