docs: pdp proof clock docs #2379

Job	Run time
ci-lint	16s
build-mainnet	5m 14s
lint	4m 9s
setup-params	7s
build-debug	4m 59s
build-2k	5m 4s
build-calibnet	5m 25s
build-forest	4m 55s
gofmt	27s
gen-check	6m 38s
mod-tidy-check	42s
test (test-all, `go list ./... \| grep -v curio/itests`)	5m 18s
test (test-itest-harmonyDB, ./itests/harmonydb_test.go)	4m 11s
test (test-itest-curio, ./itests/curio_test.go)	7m 28s
test (test-itest-alertnow, ./itests/alertnow_test.go)	2m 4s
	56m 57s

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