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Possessive its

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Co-authored-by: Henrik Tjäder <henrik@tjaders.com>
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book/en/src/internals/targets.md
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@ -53,7 +53,7 @@ showing two tasks A and B where A has higher priority but shares a resource with
At time *t1*, task B locks the shared resource by selectively disabling all other tasks which share
the resource using the NVIC. In effect this raises the virtual priority ceiling. Task A is one such
task that shares resources with task B. At time *t2*, task A is either spawned by task B or becomes
pending through an interrupt condition, but does not yet preempt task B even though it's priority is
pending through an interrupt condition, but does not yet preempt task B even though its priority is
greater. This is because the NVIC is preventing it from starting due to task A's source mask being
disabled. At time *t3*, task B releases the lock by re-enabling the tasks in the NVIC. Because
task A was pending and has a higher priority than task B, it immediately preempts task B and is