fix(docs): add notes about indexer in rpc specs #9003

Job	Run time
dprint-format	8s
diff	14s
typos / Spell Check with Typos	12s
turborepo / pnpm audit	11s
turborepo / Lint, Build, and Test	2m 52s
docusaurus	0s
docs-lint	0s
license-check	7s
move-ide	0s
move-tests	0s
ledgernano	0s
rosetta / validation	8m 13s
e2e / Localnet	13m 21s
vercel-deploy / Vercel Explorer Preview	0s
vercel-deploy / Vercel Explorer Staging	0s
vercel-deploy / Vercel UI Kit Preview	0s
vercel-deploy / Vercel UI Kit Production	0s
vercel-deploy / Vercel Wallet Dashboard Preview	0s
vercel-deploy / Vercel Wallet Dashboard Staging	0s
vercel-deploy / Vercel apps-backend Preview	0s
vercel-deploy / Vercel apps-backend Production	0s
rust / rust-lints / rustfmt	14s
rust / deny / cargo deny (bans, licenses, sources)	8s
rust / rust-lints / cargo-sort	7s
rust / deny / cargo deny (advisories)	7s
rust / rust-lints / clippy	0s
rust / external-changes	0s
rust / execution-cut	0s
rust / crates-changes	0s
rust / crates-tests	0s
rust / external-tests	0s
	25m 54s

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