doc/api: add difference between hook_url and hook_process_hashtable

doc/en/weechat_plugin_api.en.adoc

@@ -10981,6 +10981,10 @@ _WeeChat ≥ 4.1.0._
 
 URL transfer.
 
+This function is similar to <<_hook_process_hashtable,hook_process_hashtable>>
+with command "url:..." but it uses a thread instead of new process, making it
+more lightweight and thus recommended for this usage.
+
 Prototype:
 
 [source,c]

doc/fr/weechat_plugin_api.fr.adoc

@@ -11185,6 +11185,10 @@ _WeeChat ≥ 4.1.0._
 
 Transfert d'URL.
 
+Cette fonction est similaire à <<_hook_process_hashtable,hook_process_hashtable>>
+avec la commande "url:..." mais elle utilise un thread au lieu d'un nouveau
+processus, la rendant plus légère et donc recommandée pour cet usage.
+
 Prototype :
 
 [source,c]

doc/it/weechat_plugin_api.it.adoc

@@ -11394,6 +11394,10 @@ _WeeChat ≥ 4.1.0._
 
 URL transfer.
 
+This function is similar to <<_hook_process_hashtable,hook_process_hashtable>>
+with command "url:..." but it uses a thread instead of new process, making it
+more lightweight and thus recommended for this usage.
+
 Prototipo:
 
 [source,c]

doc/ja/weechat_plugin_api.ja.adoc

@@ -11127,6 +11127,10 @@ _WeeChat ≥ 4.1.0._
 
 URL transfer.
 
+This function is similar to <<_hook_process_hashtable,hook_process_hashtable>>
+with command "url:..." but it uses a thread instead of new process, making it
+more lightweight and thus recommended for this usage.
+
 プロトタイプ:
 
 [source,c]

doc/sr/weechat_plugin_api.sr.adoc

@@ -10702,6 +10702,11 @@ _WeeChat ≥ 4.1.0._
 
 URL трансфер.
 
+// TRANSLATION MISSING
+This function is similar to <<_hook_process_hashtable,hook_process_hashtable>>
+with command "url:..." but it uses a thread instead of new process, making it
+more lightweight and thus recommended for this usage.
+
 Прототип:
 
 [source,c]