doc: add version 2.2 in Python example for function string_format_size (plugin API reference)

doc/en/weechat_plugin_api.en.adoc

@@ -1718,7 +1718,7 @@ char *str = weechat_string_format_size (2097152);  /* str == "2.10 MB" */
 free (str);
 ----
 
-Script (Python):
+Script (Python), _WeeChat ≥ 2.2_:
 
 [source,python]
 ----

doc/fr/weechat_plugin_api.fr.adoc

@@ -1751,7 +1751,7 @@ char *str = weechat_string_format_size (2097152);  /* str == "2.10 Mo" */
 free (str);
 ----
 
-Script (Python) :
+Script (Python), _WeeChat ≥ 2.2_ :
 
 [source,python]
 ----

doc/it/weechat_plugin_api.it.adoc

@@ -1790,7 +1790,7 @@ char *str = weechat_string_format_size (2097152);  /* str == "2.10 MB" */
 free (str);
 ----
 
-Script (Python):
+Script (Python), _WeeChat ≥ 2.2_:
 
 [source,python]
 ----

doc/ja/weechat_plugin_api.ja.adoc

@@ -1724,7 +1724,8 @@ char *str = weechat_string_format_size (2097152);  /* str == "2.10 MB" */
 free (str);
 ----
 
-スクリプト (Python) での使用例:
+// TRANSLATION MISSING
+Script (Python), _WeeChat ≥ 2.2_:
 
 [source,python]
 ----