fix doc of TaskResourceRequest

Author: Ngone51

core/src/main/scala/org/apache/spark/resource/TaskResourceRequest.scala

@@ -27,7 +27,8 @@ import org.apache.spark.annotation.{Evolving, Since}
  * Use [[TaskResourceRequests]] class as a convenience API.
  *
  * @param resourceName Resource name
- * @param amount Expected amount of the resource, must be either <= 0.5 or a whole number
+ * @param amount Expected amount of the resource, must be either less than or equal to 0.5
+ *               or a whole number
  */
 @Evolving
 @Since("3.1.0")