Improving description

rules/S1643/csharp/rule.adoc

@@ -1,6 +1,6 @@
 == Why is this an issue?
 
-Concatenating string literals or strings in a loop using the `+` operator creates a new string object for each concatenation. This can lead to a large number of intermediate string objects and can be inefficient. The `StringBuilder` class is more efficient than string concatenation, especially when the operator is repeated over and over as in loops.
+Concatenating multiple string literals or strings using the `+` operator creates a new string object for each concatenation. This can lead to a large number of intermediate string objects and can be inefficient. The `StringBuilder` class is more efficient than string concatenation, especially when the operator is repeated over and over as in loops.
 
 == How to fix it