Typo in execParallel.c

Hi, all
Lately I was reading Parallelism of Postgres, and I was confused when reading the comment of function ExecParallelEstimate :
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* While we're at it, count the number of PlanState nodes in the tree, so
* we know how many SharedPlanStateInstrumentation structures we need.
static bool
ExecParallelEstimate(PlanState *planstate, ExecParallelEstimateContext *e)
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The structure SharedPlanStateInstrumentation is not exists at all. And I noticed that the so called “SharedPlanStateInstrumentation”
maybe is the structure Instrumentation now, which is used for storing information of planstate in parallelism.

So, I think the comment is out of date now, isn’t it?

Maybe we can modified it from “SharedPlanStateInstrumentation” to “Instrumentation” for clear

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