help: Use new attack stats separator in unit descriptions

Closes #2873.

changelog.md

@@ -7,6 +7,9 @@
      * S12 Fixed north treasure chest disappearing
    * The Rise of Wesnoth
      * New set of story art.
+ ### Help browser
+   * Unit descriptions use the new multiplication sign format for attack lists
+     now (issue #2873).
  ### Language and i18n
    * Updated translations: Chinese (Simplified), Czech, French, Galician, Polish
  ### User Interface

src/help/help_topic_generators.cpp

@@ -524,7 +524,7 @@ std::string unit_topic_generator::operator()() const {
 			push_tab_pair(row, lang_weapon);
 			push_tab_pair(row, lang_type);
 			attack_ss.str(clear_stringstream);
-			attack_ss << attack.damage() << font::unicode_en_dash << attack.num_attacks()
+			attack_ss << attack.damage() << font::weapon_numbers_sep << attack.num_attacks()
 				<< " " << attack.accuracy_parry_description();
 			push_tab_pair(row, attack_ss.str());
 			attack_ss.str(clear_stringstream);