typo

describing-hierachical-structure-with-aria-level.md

@@ -13,7 +13,7 @@ The attribute `aria-level` can be used on the following roles:
 
 ## `heading` Role
 
-Used together, the attribute `aria-level` and role `heading` will be treated the same by assistive technologies as the native HTML header elements: `h1', `h2', `h3', `h4` and `h5`. Do not use attribute `aria-level` and `heading` when a native HTML element can be used.
+Used together, the attribute `aria-level` and role `heading` will be treated the same by assistive technologies as the native HTML header elements: `h1`, `h2`, `h3`, `h4` and `h5`. Do not use attribute `aria-level` and `heading` when a native HTML element can be used.
 
 This example uses the `heading` role and `aria-level` attribute to communicate levels of headings for a graph created with an SVG. The headings "Deciduous Trees" and "Evergreen Trees" are both subheadings to "Total Trees per Year".
 
@@ -28,7 +28,7 @@ This example uses the `heading` role and `aria-level` attribute to communicate l
 
 ### Remediation Uses Cases
 
-Because the attribute `aria-level` and the role `heading` can be used to approximate a native HTML section heading element, legacy code which cannot be converted to using `h1` should add these roles and attributes to their website's header elements.
+Because the attribute `aria-level` and the role `heading` can be used to approximate a native HTML section heading element, legacy code which cannot be converted to using HTML header elements should add these roles and attributes to their website's header elements.
 
 For example, "Definition of a Room" is a subsection of "Housing Specification":