docs/site/ does not exist on main until PR #21013 merges. Without a
guard, the docs-site job fires for merge_group events (docs_site=true
for all non-PR events) and fails on npm ci in a missing directory,
blocking this PR from merging itself.

Add a presence check on docs/site/package.json; steps are skipped
(job passes) when the directory is absent. Also:
- node-version '20' -> '20.x' (standard semver range notation)
- drop secrets:inherit from docs-site job (build needs no secrets)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…curacy fixes (#21018)

## Summary

Addresses findings from the w19 weekly docs full check against
`release/3.4`.

## Changes

### Broken GitHub blob links fixed — `versioned_docs/version-v3.3/`

| File | Fix |
|------|-----|
| `interacting-with-erigon/erigon.md` | `README` → `README.md` |
| `fundamentals/modules/rpc-daemon.md` | `README` → `README.md` (×2) |
| `fundamentals/modules/downloader.md` | `readme` → `readme.md` |

### Content & language fixes

| Category | File | Fix |
|----------|------|-----|
| Semantic | `docs/fundamentals/sync-modes.md` | "three prune modes" →
"four" (full / minimal / blocks / archive); frontmatter updated |
| Semantic | `versioned_docs/version-v3.3/fundamentals/sync-modes.md` |
same |
| Semantic | `docs/about/contributing.md` | "Go 1.24+" → "Go 1.25+"
(matches `go.mod`) |
| Syntax |
`docs/get-started/easy-nodes/how-to-run-an-ethereum-node/index.md` | "a
Ethereum" → "an Ethereum"; flag explanation corrected from Gnosis/Chiado
to Ethereum mainnet; `--http.addr="0.0.0.0"` → `--http.addr=0.0.0.0` |
| Syntax | `docs/.../gnosis-with-an-external-cl.md` (v3.4 + v3.3) | "a
Ethereum" → "an Ethereum" |
| Syntax |
`versioned_docs/version-v3.3/.../how-to-run-an-ethereum-node/index.md` |
"a Ethereum" → "an Ethereum" |
| Syntax | `docs/fundamentals/basic-usage.mdx` (v3.4 + v3.3) | "a
archive" → "an archive"; missing `\` line continuation added |
| Syntax | `docs/staking/external-consensus-client-as-validator.md`
(v3.4 + v3.3) | missing `\` line continuation added |
| Syntax |
`versioned_docs/version-v3.3/fundamentals/multiple-instances.md` |
missing `\` line continuation added |
| Syntax |
`versioned_docs/version-v3.3/fundamentals/modules/downloader.md` |
`--downloader.disable.ipv4` described as "Turns off ipv6" — corrected to
ipv4 |
| Spell | `docs/staking/external-consensus-client-as-validator.md` (v3.4
+ v3.3) | "Lighhouse" → "Lighthouse" |
| Spell | `docs/.../gnosis-with-an-external-cl.md` (v3.4 + v3.3) |
"Lightouse" → "Lighthouse"; "your is syncing" → "your node is syncing" |
| Branding | `versioned_docs/version-v3.3/about/contributing.md` |
"Github" → "GitHub" |
| Accuracy | `docs/fundamentals/basic-usage.mdx` + v3.3,
`docs/get-started/easy-nodes/.../index.md` + v3.3,
`docs/fundamentals/configuring-erigon/index.mdx` + v3.3 |
`--torrent.download.rate` description unified across all 6 files:
correct default (512mb), shared-machine note, and `Inf` option |

After this merges, a follow-up PR will cherry-pick to `main` on top of
#21013.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Bloxster <bloxster@proton.me>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>