doc: add argument "subplugin" in function unhook_all (plugin API reference)

doc/en/weechat_plugin_api.en.asciidoc

@@ -10393,14 +10393,19 @@ Prototype:
 
 [source,C]
 ----
-void weechat_unhook_all ();
+void weechat_unhook_all_plugin (const char *subplugin);
 ----
 
+Arguments:
+
+* 'subplugin': if not NULL, unhook only hooks with this "subplugin" set
+  (this argument is not available in scripting API)
+
 C example:
 
 [source,C]
 ----
-weechat_unhook_all ();
+weechat_unhook_all (NULL);
 ----
 
 Script (Python):

doc/fr/weechat_plugin_api.fr.asciidoc

@@ -10596,14 +10596,19 @@ Prototype :
 
 [source,C]
 ----
-void weechat_unhook_all ();
+void weechat_unhook_all (const char *subplugin);
 ----
 
+Paramètres :
+
+* 'subplugin' : si non NULL, décrocher uniquement les "hooks" qui ont ce
+  "subplugin" défini (ce paramètre n'est pas disponible dans l'API script)
+
 Exemple en C :
 
 [source,C]
 ----
-weechat_unhook_all ();
+weechat_unhook_all (NULL);
 ----
 
 Script (Python) :

doc/it/weechat_plugin_api.it.asciidoc

@@ -10742,14 +10742,20 @@ Prototipo:
 
 [source,C]
 ----
-void weechat_unhook_all ();
+void weechat_unhook_all (const char *subplugin);
 ----
 
+Argomenti:
+
+// TRANSLATION MISSING
+* 'subplugin': if not NULL, unhook only hooks with this "subplugin" set
+  (this argument is not available in scripting API)
+
 Esempio in C:
 
 [source,C]
 ----
-weechat_unhook_all ();
+weechat_unhook_all (NULL);
 ----
 
 Script (Python):

doc/ja/weechat_plugin_api.ja.asciidoc

@@ -10407,14 +10407,20 @@ weechat.unhook(my_hook)
 
 [source,C]
 ----
-void weechat_unhook_all ();
+void weechat_unhook_all (const char *subplugin);
 ----
 
+引数:
+
+// TRANSLATION MISSING
+* 'subplugin': if not NULL, unhook only hooks with this "subplugin" set
+  (this argument is not available in scripting API)
+
 C 言語での使用例:
 
 [source,C]
 ----
-weechat_unhook_all ();
+weechat_unhook_all (NULL);
 ----
 
 スクリプト (Python) での使用例: