Comment reworded based on feedback.

lib/elements/dom-repeat.html

@@ -254,12 +254,12 @@
          * fps) to target by throttling the number of instances rendered each
          * frame to not exceed the budget for the target frame rate.  The
          * framerate is effectively the number of `requestAnimationFrame`s that
-         * it tries to allow to actually fire in a given second, and it targets
-         * this by empirically measuring the time between rAF's and throttling
-         * up/down the number of items created each `rAF`. Setting this to a 
-         * higher number will allow lower latency and higher throughput for
-         * event handlers and other tasks, but will result in a longer time for
-         * the remaining items to complete rendering.
+         * it tries to allow to actually fire in a given second. It does this
+         * by measuring the time between `rAF`s and continuously adjusting the
+         * number of items created each `rAF` to maintain the target framerate.
+         * Setting this to a higher number allows lower latency and higher
+         * throughput for event handlers and other tasks, but results in a
+         * longer time for the remaining items to complete rendering.
          */
         targetFramerate: {
           type: Number,