**Do you want to request a _feature_ or report a _bug_?**
Enhancement

**What is the current behavior?**
Element type checker is not as informative as the other ones.

**What is the expected behavior?**
It would be nice to provide the actual type of the prop passed similarly to other type checkers. I.e., instead of 

> Invalid prop `Prop` supplied to `Component`, expected a single ReactElement.

say

> Invalid prop `Prop` of type `type` supplied to `Component`, expected a single ReactElement.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
Seeing this on 15.2.1 but I think it's also applicable to previous versions.

I know the general intention is to move away from prop types, but if there isn't a specific reason for the current behavior I can look into making this more pretty.

if (!Array.isArray(arrayOfTypeCheckers)) {
    warning(false, 'Invalid argument supplied to oneOfType, expected an instance of array.');
    return emptyFunction.thatReturnsNull;
  }
  function validate(props, propName, componentName, location, propFullName) {
    for (var i = 0; i < arrayOfTypeCheckers.length; i++) {
      var checker = arrayOfTypeCheckers[i];
      if (
        checker(
          props,
          propName,
          componentName,
          location,
          propFullName,
          ReactPropTypesSecret
        ) == null
      ) {
        return null;
      }
    }
    var locationName = ReactPropTypeLocationNames[location];
    return new Error(
      `Invalid ${locationName} \`${propFullName}\` supplied to ` +
      `\`${componentName}\`.`
    );
  }
  return createChainableTypeChecker(validate);
}
function createNodeChecker() {