Change NO_EXPLICIT_VISIBILITY_IN_API_MODE diagnostic range to 'declaration modifiers + name'.

Motivation: missing visibility modifier is an error in visibility modifiers list, so we should highlight this list.
Including a name in the range is convenient for using alt+enter (you don't have to move cursor from name to fun/class/val keyword)

 Also change NO_EXPLICIT_RETURN_TYPE_IN_API_MODE diagnostic range to 'declaration name' to match corresponding IDE inspection.

Fix stylistic problems and typos after review

compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsWithExplicitApi.kt

@@ -16,8 +16,8 @@ abstract class AbstractDiagnosticsWithExplicitApi : AbstractDiagnosticsTest() {
     override fun defaultLanguageVersionSettings(): LanguageVersionSettings =
         CompilerTestLanguageVersionSettings(
             DEFAULT_DIAGNOSTIC_TESTS_FEATURES,
-            ApiVersion.KOTLIN_1_3,
-            LanguageVersion.KOTLIN_1_3,
+            LanguageVersionSettingsImpl.DEFAULT.apiVersion,
+            LanguageVersionSettingsImpl.DEFAULT.languageVersion,
             mapOf(AnalysisFlags.explicitApiMode to ExplicitApiMode.STRICT)
         )
 }