[Kotlin]Formatted according to the kotlin style guide (#5196)

* Do not put a space
https://kotlinlang.org/docs/reference/coding-conventions.html#horizontal-whitespace

* Use 4 spaces for indentation
https://kotlinlang.org/docs/reference/coding-conventions.html#formatting

* Put spaces around the `=` sign
https://kotlinlang.org/docs/reference/coding-conventions.html#method-call-formatting

* Indent the expression body by 4 spaces
https://kotlinlang.org/docs/reference/coding-conventions.html#expression-body-formatting

* run ./bin/kotlin-springboot-petstore-all.sh

samples/openapi3/server/petstore/kotlin-springboot-reactive/.openapi-generator/VERSION

@@ -1 +1 @@
-4.2.2-SNAPSHOT
+4.3.0-SNAPSHOT

samples/openapi3/server/petstore/kotlin-springboot-reactive/src/main/kotlin/org/openapitools/model/Pet.kt

@@ -16,10 +16,10 @@ import io.swagger.annotations.ApiModelProperty
 
 /**
  * A pet for sale in the pet store
- * @param id 
- * @param category 
  * @param name 
  * @param photoUrls 
+ * @param id 
+ * @param category 
  * @param tags 
  * @param status pet status in the store
  */

samples/openapi3/server/petstore/kotlin-springboot/.openapi-generator/VERSION

@@ -1 +1 @@
-4.2.2-SNAPSHOT
+4.3.0-SNAPSHOT

samples/openapi3/server/petstore/kotlin-springboot/src/main/kotlin/org/openapitools/model/Pet.kt

@@ -16,10 +16,10 @@ import io.swagger.annotations.ApiModelProperty
 
 /**
  * A pet for sale in the pet store
- * @param id 
- * @param category 
  * @param name 
  * @param photoUrls 
+ * @param id 
+ * @param category 
  * @param tags 
  * @param status pet status in the store
  */