Documentation/: it's -> its where appropriate

Fix obvious cases of "it's" being used when "its" was meant.

Signed-off-by: Francis Galiegue <fgaliegue@gmail.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/scsi/dtc3x80.txt b/Documentation/scsi/dtc3x80.txt
index e8ae623..1d7af9f 100644
--- a/Documentation/scsi/dtc3x80.txt
+++ b/Documentation/scsi/dtc3x80.txt
@@ -12,7 +12,7 @@
 The DTC3x80 does not support DMA but it does have Pseudo-DMA which is
 supported by the driver.
 
-It's DTC406 scsi chip is supposedly compatible with the NCR 53C400.
+Its DTC406 scsi chip is supposedly compatible with the NCR 53C400.
 It is memory mapped, uses an IRQ, but no dma or io-port.  There is
 internal DMA, between SCSI bus and an on-chip 128-byte buffer.  Double
 buffering is done automagically by the chip.  Data is transferred