doc: Add missing reference to track_cost_delay_timing.

Oversight in commit bb8dff9995.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/2d6745a66b12e980fb12bd06d583a66231b5ed5c

Modified Files
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doc/src/sgml/monitoring.sgml | 5 +++++
1 file changed, 5 insertions(+)

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