rcu: Add comments to final rcu_gp_cleanup() "if" statement

The final "if" statement in rcu_gp_cleanup() has proven to be rather
confusing, straightforward though it might have seemed when initially
written.  This commit therefore adds comments to its "then" and "else"
clauses to at least provide a more elevated form of confusion.

Reported-by: Boqun Feng <[email protected]>
Reported-by: Frederic Weisbecker <[email protected]>
Reported-by: Neeraj Upadhyay <[email protected]>
Reported-by: Uladzislau Rezki <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

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