Fix README and docs pages that no longer match the code

Bring the READMEs and the docs pages (en and ja) in line with the
current header:

- Fix the client sample that does not compile, the Transfer-Encoding
  statement for default headers, the verifier callback comment, the
  thread pool spawn rule, the sanitize_filename description, and the
  inverted Accept-Encoding sentence.
- Describe recent behaviour: TLS errors behind Read/Write failures,
  Host validation, Connection: close for a body without length,
  content_reader rules, refused CONNECT, WebSocketClient proxies,
  CPPHTTPLIB_INTERIM_RESPONSE_MAX_COUNT, the SSE event size limit, and
  the payload limit of the Stream API.
- Complete the API references of WebSocket, WebSocketClient and the
  stream:: helpers, and the SSE reconnect rules.
- Fix cookbook pages: keychain loading on every backend, received Close
  status, a multipart sample that trusted the client's file name, an
  echo sample that sent binary as text, SNI, pre-request handler scope,
  stop() with WebSocket handlers, and the thread pool notes.
- Restore the mutex in the LLM app's Chapter 5 code.

docs-src/pages/en/cookbook/w03-websocket-close.md

@@ -67,7 +67,7 @@ To notify in-flight clients that the server is going down, use `GoingAway`.
 ws.close(httplib::ws::CloseStatus::GoingAway, "server restarting");
 ```
 
-The client can inspect that status and decide whether to reconnect.
+On the client, `read()` just returns `Fail`; the status and reason it received aren't exposed. If the client needs to tell a restart from other closures, send it a message first (say, `ws.send("restarting")`), then call `close()`.
 
 ## Example: a tiny chat with quit