clang-tidy: sync argument names in prototype and definition

Discovered with clang-tidy checker
`readability-inconsistent-declaration-parameter-name`.

Also:
- do not enforce the above because of inconsistencies still present
  between public API prototypes and definitions. (Also betwen man page
  protos, and man page examples, and other parts of the code, e.g.
  `easy` vs `curl` vs `d` vs `handle`) Perhaps subject for a future
  effort:
  https://github.com/curl/curl/actions/runs/22166472728/job/64094691653
- enable and fix `readability-named-parameter` where missing.

Refs:
https://clang.llvm.org/extra/clang-tidy/checks/readability/inconsistent-declaration-parameter-name.html
https://clang.llvm.org/extra/clang-tidy/checks/readability/named-parameter.html

Closes #20624

lib/ws.h

@@ -34,7 +34,8 @@ extern const struct Curl_scheme Curl_scheme_wss;
 #define CURL_META_PROTO_WS_CONN   "meta:proto:ws:conn"
 
 CURLcode Curl_ws_request(struct Curl_easy *data, struct dynbuf *req);
-CURLcode Curl_ws_accept(struct Curl_easy *data, const char *mem, size_t len);
+CURLcode Curl_ws_accept(struct Curl_easy *data,
+                        const char *mem, size_t nread);
 
 #else
 #define Curl_ws_request(x, y) CURLE_OK