Updating week3 slides

slides/testing.html

@@ -88,7 +88,7 @@ Therefore…
 - Visual impairments
 - Difficulty understanding content
 - Difficulty hearing
-- Difficulty manipulating mouse our keyboard
+- Difficulty manipulating mouse or keyboard
 
 all affect accessibility
 
@@ -98,7 +98,7 @@ all affect accessibility
 # What is the goal?
 All users interact with the *same* website or app as anyone else
 
-Users may use browser features or a specialist accessibility tool to customize their experience
+Users may use browser features or a specialized accessibility tool to customize their experience
 
 --
 **This is Key** 
@@ -227,7 +227,7 @@ The tasks you are evaluating is
 2. Whether a student can "Report a Concern" about how accessible the website is
 What are some problems you found? Try to separate out what is difficult for you as a beginner from what is a flaw in the website itself. 
 
-[Share your findings]({{site.discussion}}/454526)
+[Share your findings](https://edstem.org/us/courses/41400/discussion/3598210)
 
 ---
 # Wednesday's [Assessment Homework]({{site.baseurl}}/assignments/website.html)
@@ -274,7 +274,7 @@ Content should be
    - *Impact* – Is it hard or easy to overcome this?
    - *Persistence* - Is there a way to avoid this problem? 
 
-What do you think? Discuss with your neighbor  and post any questions [on Ed]({{site.discussion}}/454525)
+What do you think? Discuss with your neighbor  and post any questions [on Ed](https://edstem.org/us/courses/41400/discussion/3598210)
 ???
 This is debatable, but frequency is low (it only occurs once on this site. If you are writing up all missing image alt text as a group, you might increase your estimate of frequency, but this site doesn't appear to have a lot of undescribed images); impact is low (it is possible to determine the purpose of this image by either clicking on it to see what it links to, or inferring some things from the external link and image file name (both unpleasant alternatives for a screen reader user); and persistence is high (it's not going to go away).