all: fix typos in comments (#21118)

# Conflicts:
#	accounts/abi/bind/backends/simulated.go
#	cmd/puppeth/module_dashboard.go
#	core/blockchain_test.go
#	core/rawdb/chain_iterator.go
#	core/state/snapshot/difflayer.go
#	core/state/snapshot/iterator.go
#	core/state/snapshot/iterator_fast.go
#	core/state/snapshot/snapshot.go
#	core/state/snapshot/wipe.go
#	core/tx_pool.go
#	les/clientpool.go
#	les/peer.go
#	mobile/doc.go
#	trie/committer.go
#	trie/database.go