NTB: fix IDT Kconfig typos/spellos

Fix typos in drivers/ntb/hw/idt/Kconfig.
Use consistent spelling and capitalization.

Fixes: bf2a952d ("NTB: Add IDT 89HPESxNTx PCIe-switches support")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Allen Hubbe <allenbh@gmail.com>
Cc: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>

drivers/ntb/hw/idt/Kconfig

@@ -4,11 +4,11 @@ config NTB_IDT
 	depends on PCI
 	select HWMON
 	help
-	 This driver supports NTB of cappable IDT PCIe-switches.
+	 This driver supports NTB of capable IDT PCIe-switches.
 
 	 Some of the pre-initializations must be made before IDT PCIe-switch
-	 exposes it NT-functions correctly. It should be done by either proper
-	 initialisation of EEPROM connected to master smbus of the switch or
+	 exposes its NT-functions correctly. It should be done by either proper
+	 initialization of EEPROM connected to master SMbus of the switch or
 	 by BIOS using slave-SMBus interface changing corresponding registers
 	 value. Evidently it must be done before PCI bus enumeration is
 	 finished in Linux kernel.