[mpp, tests] Minor: fix incorrect testdata

It was missed on rr/CI because those tests run only on macs, and
currrently CI has some troubles with that

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics/KotlinToolingDiagnostics.kt

@@ -494,7 +494,7 @@ object KotlinToolingDiagnostics {
                       ${trace.shortcut}()
                   }
                 
-                Please declare the required targets explicitly: 
+                Please declare the required targets explicitly:
                 
                   kotlin {
                       ${trace.shortcut}X64()

libraries/tools/kotlin-gradle-plugin/src/functionalTest/resources/expectedDiagnostics/KotlinDefaultHierarchyFallbackNativeTargetShortcutUsageDetected-ios.txt

@@ -14,7 +14,7 @@ Please declare the required targets explicitly:
       /* ... */
   }
 
-After that, replace `by getting` with a static accessor:
+After that, replace `by getting` with static accessors:
 
   sourceSets {
       commonMain { ... }

libraries/tools/kotlin-gradle-plugin/src/functionalTest/resources/expectedDiagnostics/KotlinDefaultHierarchyFallbackNativeTargetShortcutUsageDetected-tvos.txt

@@ -14,7 +14,7 @@ Please declare the required targets explicitly:
       /* ... */
   }
 
-After that, replace `by getting` with a static accessor:
+After that, replace `by getting` with static accessors:
 
   sourceSets {
       commonMain { ... }

libraries/tools/kotlin-gradle-plugin/src/functionalTest/resources/expectedDiagnostics/KotlinDefaultHierarchyFallbackNativeTargetShortcutUsageDetected-watchos.txt

@@ -14,7 +14,7 @@ Please declare the required targets explicitly:
       /* ... */
   }
 
-After that, replace `by getting` with a static accessor:
+After that, replace `by getting` with static accessors:
 
   sourceSets {
       commonMain { ... }