doc: add examples of division in ${calc:...} (plugin API reference)

doc/en/weechat_plugin_api.en.adoc

@@ -2584,10 +2584,14 @@ expanded to last):
   `+**+`: power. |
   `+${calc:5+2*3}+` +
   `+${calc:(5+2)*3}+` +
+  `+${calc:10/4}+` +
+  `+${calc:10//4}+` +
   `+${calc:9.2%3}+` +
   `+${calc:2**16}+` |
   `+11+` +
   `+21+` +
+  `+2.5+` +
+  `+2+` +
   `+0.2+` +
   `+65536+`
 

doc/fr/weechat_plugin_api.fr.adoc

@@ -2632,10 +2632,14 @@ première étendue à la dernière) :
   `+**+`: puissance. |
   `+${calc:5+2*3}+` +
   `+${calc:(5+2)*3}+` +
+  `+${calc:10/4}+` +
+  `+${calc:10//4}+` +
   `+${calc:9.2%3}+` +
   `+${calc:2**16}+` |
   `+11+` +
   `+21+` +
+  `+2.5+` +
+  `+2+` +
   `+0.2+` +
   `+65536+`
 

doc/it/weechat_plugin_api.it.adoc

@@ -2691,10 +2691,14 @@ expanded to last):
   `+**+`: power. |
   `+${calc:5+2*3}+` +
   `+${calc:(5+2)*3}+` +
+  `+${calc:10/4}+` +
+  `+${calc:10//4}+` +
   `+${calc:9.2%3}+` +
   `+${calc:2**16}+` |
   `+11+` +
   `+21+` +
+  `+2.5+` +
+  `+2+` +
   `+0.2+` +
   `+65536+`
 

doc/ja/weechat_plugin_api.ja.adoc

@@ -2602,10 +2602,14 @@ str5 = weechat.string_eval_expression("password=abc password=def", {}, {}, optio
   `+**+`: power. |
   `+${calc:5+2*3}+` +
   `+${calc:(5+2)*3}+` +
+  `+${calc:10/4}+` +
+  `+${calc:10//4}+` +
   `+${calc:9.2%3}+` +
   `+${calc:2**16}+` |
   `+11+` +
   `+21+` +
+  `+2.5+` +
+  `+2+` +
   `+0.2+` +
   `+65536+`