tools: i2ctransfer: consequently document -a

The text describing the address to be used did not reflect the recent
change where some of the functionality of '-f' has been seperated into
'-a'.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

CHANGES

@@ -5,6 +5,7 @@ master
   tools: Consistently use snprintf instead of sprintf
   decode-dimms: Print SPD revision for DDR3 too
                 Move SDR-specific code
+  i2ctransfer: Mention '-a' everywhere in the manpage
 
 4.1 (2018-11-30)
   Makefile: Make STRIP, DESTDIR and PREFIX overridable

tools/i2ctransfer.8

@@ -96,10 +96,12 @@ It is parsed as an unsigned 16 bit integer, but note that the Linux Kernel appli
 specifies the 7-bit address of the chip to be accessed for this message, and is an integer.
 If omitted, reuse the previous address.
 Normally, addresses outside the range of 0x03-0x77 and addresses with a kernel driver attached to them will be blocked.
-With
+This can be overridden with
+.I -a
+(all) or
 .I -f
-(force), all addresses can be used.
-Be very careful when using that!
+(force).
+Be very careful when using these!
 10-bit addresses are currently not supported at all.
 
 .PP