doc/change_log: Remove MISRA rule 10.3 fix

MISRA C 2012 rule 10.3 defects fixation note is removed
in this patch as not all rule 10.3 defects were fixed.

Signed-off-by: Ahmed Gadallah <ahmed.gadallah@arm.com>
Change-Id: I9a88314f5c9259fe0c95faf525a892dad03237a4