Minor tweaks found while writing tests

- Add test coverage ignore for missing axis else branch - it's not reachable normally, but it's there as a safety catch in case we ever misuse setPosition

- Fix parseInt that's missing a base10 radix

- Fix docblock comment with incorrect example params

src/objectFitPolyfill.js

@@ -99,7 +99,7 @@
  *
  * @param {string} axis - either "x" or "y"
  * @param {node} $media - img or video element
- * @param {string} objectPosition - e.g. "50% 50%", "top bottom"
+ * @param {string} objectPosition - e.g. "50% 50%", "top left"
  */
  var setPosition = function(axis, $media, objectPosition) {
  var position, other, start, end, side;
@@ -109,6 +109,7 @@
  objectPosition[1] = objectPosition[0];
  }
 
+ /* istanbul ignore else */
  if (axis === 'x') {
  position = objectPosition[0];
  other = objectPosition[1];
@@ -143,7 +144,7 @@
 
  // Percentage values (e.g., 30% 10%)
  if (position.indexOf('%') >= 0) {
- position = parseInt(position);
+ position = parseInt(position, 10);
 
  if (position < 50) {
  $media.style[start] = position + '%';