docs: fix typos

Author: staszek998

docs/stories/01-foundations/elevation.mdx

@@ -8,15 +8,15 @@ Modern UI is composed of different layers, be that modals, popovers or tooltips.
 
 ## Shadows
 
-Shadows are used to create a sense of depth and separation between elements. They might be used to indicate evelation of
+Shadows are used to create a sense of depth and separation between elements. They might be used to indicate elevation of
 an element e.g. a Popover, or alternatively, they can indicate that UI can scroll below another element e.g. Tables.
 
 ## Z-Index
 
 The z-index determines the stacking order of elements. Elements with a higher z-index always sit in front of elements
-with a lower z-index. Our current collection of z-index values are lised below with their alias, they're currently
-non-linear to support growing other common use-cases we may not have encountered yet. All are accessible via the theme
-object – `theme.zIndices.<alias>`.
+with a lower z-index. Our current collection of z-index values is listed below with their corresponding aliases. 
+They're currently non-linear to support growing other common use-cases we may not have encountered yet.
+All are accessible via the theme object – `theme.zIndices.<alias>`.
 
 - `navigation` – `100`
 - `overlay` – `300`