Fix the wrong explanation for itoa return
Fix the wrong explanation for itoa return

itoa returns a pointer to the resulting null-terminated string,
same as parameter str.

Change-Id: I583262751a36239f70e736bbb765490f72f6c7df
Signed-off-by: jc_.kim <dd29dda359f9c9995ad03eb5d0e774929bcceb5c@samsung.com>

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