docs: create accessibility_checker.rst in the right place

en_us/course_authors/source/accessibility/accessibility_checker.rst

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+.. _Accessibility Checker:
+
+######################
+Accessibility Checker
+######################
+
+* This feature allows you to check HTML in the editor for various 
+  WCAG and Section 508 accessibility problems.
+* The Accessibility Checker focuses on exceeding WCAG "A", "AA", 
+  and "AAA" levels.
+* The Accessibility Checker enables content authors to check for 
+  accessibility problems using an in-editor dialog, complete with 
+  a repair feature that corrects the errors on their behalf.
+
+*******************************
+Accessibility Checker Use Case
+*******************************
+
+When using the Accessibility Checker, begin by looking for the 
+accessibility icon . As you enter content into the Rich Content 
+Editor, the Accessibility Checker will automatically start looking 
+for any potential accessibility issues. Click on the icon to learn 
+more.
+
+After clicking it, the Accessibility Checker will open in the 
+sidebar menu with details on each issue found. Navigate between 
+the items to learn about each issue and apply the fixes (see 
+images below). 
+
+.. image:: ../../../shared/images/AccessibilityCheckerWidget.png
+  :alt: an image of the accessibility checker icon and menu. The 
+   accessibility checker lists various accessibility issues and 
+   includes an auto repair capability.
+  :width: 600
+
+****************************
+Accessibility Checker Review
+****************************
+
+#. **Adjacent links**: Adjacent links with the same URL should be 
+   a single link. This rule verifies link errors where the link text 
+   may include spaces and break the link into multiple links.
+
+#. **Headings**: Headings should not contain more than 120 
+   characters.
+
+#. **Image alt text**: Images should include an alt attribute 
+   describing the image content.
+
+#. **Image alt filename**: Image filenames should not be used as 
+   the alt attribute describing the image content. Currently, files 
+   uploaded directly to Canvas create a redirect that does not 
+   properly verify image filenames.
+
+#. **Image alt length**: Alt attribute text should contain fewer 
+   than 120 characters.
+
+#. **Large text contrast**: Text larger than 18pt (or bold 14pt) 
+  should display a minimum contrast ratio of 3:1.
+
+#. **Lists**: Lists should be formatted as lists.
+
+#. **Sequential headings**: Heading levels should not be skipped 
+   (e.g. H2 to H4). However, the tool does not check if the first 
+   header starts with H2 or whether the headings are sequential 
+   with the rest of the content in the page. Tables do not begin 
+   with H1, which is designated for the page title.
+
+#. **Small text contrast**: Text smaller than 18pt (or bold 14pt) 
+   should display a minimum contrast ratio of 4.5:1.
+
+#. **Table captions**: Tables should include a caption describing 
+   the contents of the table.
+
+#. **Table header scope**: Table headers should specify scope and 
+   the appropriate structure.
+
+#. **Table header**: Tables should include at least one header.
+
+***************************************
+Advantage of the Accessibility Checker
+***************************************
+
+The Accessibility Checker has the primary advantage of being very 
+low effort and having intelligible warnings and solutions for 
+content creators, who are most likely not accessibility experts. 
+We have a general goal of minimizing instances of asking content 
+creators to edit the HTML view of course content in order to make 
+it WCAG-compliant, and this helps with that significantly. 
+
+Course content will be more accessible, consistent, and predictable 
+because the TINYMCE accessibility checker reviews for the following 
+content:
+
+* Heading levels
+* Lists
+* Contrast ratios on text
+* Image alt text
+* Tables
+* Captions
+* Scopes