doc/api: add missing type for argument "count" in Python prototype of function ngettext

doc/en/weechat_plugin_api.en.adoc

@@ -537,7 +537,7 @@ Script (Python):
 [source,python]
 ----
 # prototype
-def ngettext(string: str, plural: str, count) -> str: ...
+def ngettext(string: str, plural: str, count: int) -> str: ...
 
 # example
 num_files = 2

doc/fr/weechat_plugin_api.fr.adoc

@@ -547,7 +547,7 @@ Script (Python) :
 [source,python]
 ----
 # prototype
-def ngettext(string: str, plural: str, count) -> str: ...
+def ngettext(string: str, plural: str, count: int) -> str: ...
 
 # exemple
 num_files = 2

doc/it/weechat_plugin_api.it.adoc

@@ -568,7 +568,7 @@ Script (Python):
 [source,python]
 ----
 # prototipo
-def ngettext(string: str, plural: str, count) -> str: ...
+def ngettext(string: str, plural: str, count: int) -> str: ...
 
 # esempio
 num_files = 2

doc/ja/weechat_plugin_api.ja.adoc

@@ -547,7 +547,7 @@ char *str = weechat_ngettext ("file", "files", num_files);
 [source,python]
 ----
 # プロトタイプ
-def ngettext(string: str, plural: str, count) -> str: ...
+def ngettext(string: str, plural: str, count: int) -> str: ...
 
 # 例
 num_files = 2

doc/sr/weechat_plugin_api.sr.adoc

@@ -511,7 +511,7 @@ char *str = weechat_ngettext ("file", "files", num_files);
 [source, python]
 ----
 # прототип
-def ngettext(string: str, plural: str, count) -> str: ...
+def ngettext(string: str, plural: str, count: int) -> str: ...
 
 # пример
 num_files = 2

src/plugins/python/weechat.pyi

@@ -59,7 +59,7 @@ def gettext(string: str) -> str:
     ...
 
 
-def ngettext(string: str, plural: str, count) -> str:
+def ngettext(string: str, plural: str, count: int) -> str:
     """`ngettext in WeeChat plugin API reference <https://weechat.org/doc/api#_ngettext>`_"""
     ...