Further typos and edits in the 'It is important' paragraph of the Goa…

…ls section.

conformance-challenges/index.html

@@ -39,9 +39,9 @@ <h3>Goals</h3>
 <p>The goals of this document are to catalog and characterize the challenges with accessibility guidelines conformance, and conformance verification.  We believe that a better understanding of the situations in which the WCAG 2.x
 conformance model may be difficult or impossible to apply, and the places where accessibility conformance verification scales poorly if at all, can lead to more effective conformance models and testing approaches in the future.</p>
 
-<p>It is important to recognize that success criteria in WCAG 2.x are quite distinct from the conformance model.  These criteria describe approaches to content accessibility that are thoughtfully designed to enable people with a broad range of disabilities to effectively consume and interact with web content.  Challenges with the conformance model and testing verification doesn■t mean the criteria aren■t valid. For example, while requiring human
+<p>It is important to recognize that success criteria in WCAG 2.x are quite distinct from the conformance model. These criteria describe approaches to content accessibility that are thoughtfully designed to enable people with a broad range of disabilities to effectively consume and interact with web content. Challenges with the conformance model and testing verification doesn't mean the criteria aren't valid. For example, while requiring human
 judgement to validate a page may not scale (the core of Challenge #1 below), absent that human judgement it may not be possible to deliver a fully accessible web page. Similarly, while it may not be possible to ensure that
-all 3rd party content is fully accessible (the subject of Challenge #3 below), absent review of that content by a human sufficiently versed in accessibility it may again not be possible to ensure that content is fully
+all third party content is fully accessible (the subject of Challenge #3 below), absent review of that content by a human sufficiently versed in accessibility it may again not be possible to ensure that content is fully
 accessible. Human judgement is a core part of much of WCAG 2.x for good reasons, and the challenges that arise from it important to successfully grapple with.
 </p>