Replace F extension with string interpolation

OpenRA.Mods.Common/Traits/ThrowsShrapnel.cs

@@ -40,7 +40,7 @@ namespace OpenRA.Mods.Common.Traits
 			{
 				var weaponToLower = w.ToLowerInvariant();
 				if (!rules.Weapons.TryGetValue(weaponToLower, out var weapon))
-					throw new YamlException("Weapons Ruleset does not contain an entry '{0}'".F(weaponToLower));
+					throw new YamlException($"Weapons Ruleset does not contain an entry '{weaponToLower}'");
 				return weapon;
 			}).ToArray();
 		}