Add list of available rpc apis to the online help

[piersy]

No description provided.

[github-actions]

Coverage from tests in ./e2e_test/... for ./consensus/istanbul/... at commit ea1da73

coverage: 49.0% of statements across all listed packages

coverage:  63.0% of statements in consensus/istanbul
coverage:  40.1% of statements in consensus/istanbul/announce
coverage:  54.6% of statements in consensus/istanbul/backend
coverage:   0.0% of statements in consensus/istanbul/backend/backendtest
coverage:  24.3% of statements in consensus/istanbul/backend/internal/replica
coverage:  61.4% of statements in consensus/istanbul/core
coverage:  45.0% of statements in consensus/istanbul/db
coverage:   0.0% of statements in consensus/istanbul/proxy
coverage:  64.2% of statements in consensus/istanbul/uptime
coverage:  51.8% of statements in consensus/istanbul/validator
coverage:  79.2% of statements in consensus/istanbul/validator/random

[github-actions]

Test failures:
TestMiner: miner Failed /runner/_work/celo-blockchain/celo-blockchain/consensus/consensustest/mockprotocol.go:384 +0x181 /runner/_work/celo-blockchain/celo-blockchain/miner/worker.go:466 +0xb3 /runner/_work/celo-blockchain/celo-blockchain/miner/worker.go:308 +0x515 /runner/_work/celo-blockchain/celo-blockchain/miner/worker.go:410 +0x3b /runner/_work/celo-blockchain/celo-blockchain/miner/worker.go:409 +0x1aa
This test report was produced by the test-summary action.  Made with ❤️ in Cambridge.