Docs: enhance era markers runbook #7316

Job	Run time
build-ubuntu-X64	4m 34s
test (ubuntu-22.04)	7m 18s
test (macos-14)	1m 6s
build (macos-14)	1m 22s
test (macos-14-large)	1m 27s
build-docusaurus	1m 50s
build (macos-14-large)	1m 41s
build-open-api-ui	7s
test (windows-latest)	2m 47s
build (windows-latest)	3m 49s
cargo-doc	47s
build-test-wasm	1m 52s
check	1m 42s
publish-wasm-test (mithril-client-wasm)	57s
build-test-explorer	1m 16s
publish-docs	0s
e2e (std, thales, 9.0.0, 0, #1)	1m 13s
e2e (std, thales, 9.1.0, 0, #1)	1m 20s
e2e (std, thales, 9.1.1, 0, #1)	1m 20s
e2e (std, thales, 9.2.0, 0, #1)	1m 12s
e2e (std, thales, 9.2.1, 0, #1)	1m 32s
e2e (std, pythagoras, 9.0.0, 0, #1)	1m 20s
e2e (std, pythagoras, 9.1.0, 0, #1)	1m 11s
e2e (std, pythagoras, 9.1.1, 0, #1)	1m 19s
e2e (std, pythagoras, 9.2.0, 0, #1)	1m 13s
e2e (std, pythagoras, 9.2.1, 0, #1)	1m 40s
e2e (p2p, thales, 9.1.1, 0, #1, --use-p2p-network)	1m 36s
e2e (std, thales, pythagoras, 9.1.1, 0, #1)	1m 26s
e2e (std, thales, pythagoras, 9.1.1, 0, #1, --mithril-era-regenesis-on-switch)	1m 49s
send-tests-results	18s
docker-mithril (mithril-aggregator)	25s
docker-mithril (mithril-client-cli)	24s
publish-crate-test (mithril-stm)	13s
docker-mithril (mithril-signer)	21s
publish-crate-test (mithril-build-script)	14s
docker-mithril (mithril-relay)	21s
publish-crate-test (mithril-common)	14s
unstable-release	0s
publish-crate-test (mithril-client)	15s
deploy-testing (testing-preview)	15s
deploy-testing (testing-sanchonet)	16s
	54m 2s

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