Improve finding message of ExplicitItLambdaParameter (#5117)

detekt-rules-style/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/style/ExplicitItLambdaParameter.kt

@@ -14,7 +14,7 @@ import org.jetbrains.kotlin.psi.KtLambdaExpression
 /**
  * Lambda expressions are one of the core features of the language. They often include very small chunks of
  * code using only one parameter. In this cases Kotlin can supply the implicit `it` parameter
- * to make code more concise. It fits most usecases, but when faced larger or nested chunks of code,
+ * to make code more concise. It fits most use cases, but when faced larger or nested chunks of code,
  * you might want to add an explicit name for the parameter. Naming it just `it` is meaningless and only
  * makes your code misleading, especially when dealing with nested functions.
  *
@@ -55,11 +55,16 @@ class ExplicitItLambdaParameter(val config: Config) : Rule(config) {
         super.visitLambdaExpression(lambdaExpression)
         val parameterNames = lambdaExpression.valueParameters.map { it.name }
         if (IT_LITERAL in parameterNames) {
+            val message = if (parameterNames.size == 1) {
+                "This explicit usage of `it` as the lambda parameter name can be omitted."
+            } else {
+                "`it` should not be used as name for a lambda parameter."
+            }
             report(
                 CodeSmell(
                     issue,
                     Entity.from(lambdaExpression),
-                    "This explicit usage of `it` as the lambda parameter name can be omitted."
+                    message
                 )
             )
         }