Update reflow.html

[mbgower]

An attempt to introduce a primary consideration in isolation in the Understanding document.

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[mbgower]

@scottaohara Another attempt at rewording I wrote some time ago, which I thought I'd just shove into a PR to ensure there is no novel or better-crafted text than what you have created (reviewing that is next on my list after reviewing all these branches I've created that are still lingering).
If there is no value to this, LMK and I'll close it. Otherwise, happy to try to incorporate into the work done on Reflow to date.
The only changes in this file from current is a few lines starting at 39:

 <h3>Tracking from one line to the next</h3>

  <p>The most crucial problem solved by reflow is allowing users to increase text size while keeping line length
    within the width of the display. If users are forced to scroll to read lines of text, they are more likely to
    lose their place, especially when scrolling the opposite direction to locate the start of the next line.</p>

If you think this concept is already covered, I will close this. Otherwise, feel free to lift it and then close it!

[scottaohara]

yes this is covered. not in this exact wording though (which makes sense being different authors n' all :) )

i'll make a note in my draft PR to make sure this text / a version of this text is given a proper highlight

[scottaohara]

closing per above comment / adding this as a comment to address in my reflow PR