Update ch09.md (#69)

Reference Table number corrected for section 9.3.4
Table 45 => Table 5

Author: sirnish

ch09.md

@@ -373,8 +373,8 @@ A task will not enter the Blocked state if its unblock condition is met
 at the time `xEventGroupWaitBits()` is called.
 
 Examples of conditions that will result in a task either entering the
-Blocked state, or exiting the Blocked state, are provided in Table 45.
-Table 45 only shows the least significant four binary bits of the event
+Blocked state, or exiting the Blocked state, are provided in Table 5.
+Table 5 only shows the least significant four binary bits of the event
 group and uxBitsToWaitFor values—the other bits of those two values are
 assumed to be zero.