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/asyn-ares.c

@@ -380,14 +380,14 @@ out:
  * CURLE_OPERATION_TIMEDOUT if a time-out occurred, or other errors.
  */
 CURLcode Curl_async_await(struct Curl_easy *data,
-                          struct Curl_dns_entry **entry)
+                          struct Curl_dns_entry **dns)
 {
   struct async_ares_ctx *ares = &data->state.async.ares;
   CURLcode result = CURLE_OK;
   timediff_t timeout_ms;
 
-  DEBUGASSERT(entry);
-  *entry = NULL; /* clear on entry */
+  DEBUGASSERT(dns);
+  *dns = NULL; /* clear on entry */
 
   timeout_ms = Curl_timeleft_ms(data);
   if(timeout_ms < 0) {
@@ -426,7 +426,7 @@ CURLcode Curl_async_await(struct Curl_easy *data,
     if(Curl_ares_perform(ares->channel, call_timeout_ms) < 0)
       return CURLE_UNRECOVERABLE_POLL;
 
-    result = Curl_async_is_resolved(data, entry);
+    result = Curl_async_is_resolved(data, dns);
     if(result || data->state.async.done)
       break;
 
@@ -449,7 +449,7 @@ CURLcode Curl_async_await(struct Curl_easy *data,
   /* Operation complete, if the lookup was successful we now have the entry
      in the cache. */
   data->state.async.done = TRUE;
-  *entry = data->state.async.dns;
+  *dns = data->state.async.dns;
 
   if(result)
     ares_cancel(ares->channel);