Fix typos in map guidance

src/guidance/maps/index.md.njk

@@ -77,10 +77,10 @@ Present map options in textual form, this includes:
 Add textual descriptions to visually presented elements.
 
 Use the correct semantic elements, including:
-- - button HTML tags for buttons, not other tags
+- button HTML tags for buttons, not other tags
 GOV.UK Design System components instead of custom ones
 
-Add additional semantic data to elements, including
+Add additional semantic data to elements, including:
 - metadata such as microdata or microformats
 - HTML attributes or ARIA attributes
 
@@ -117,7 +117,7 @@ Make map options accessible by keyboard, including:
 
 Common key mappings are:
 - arrow keys for panning
-- + and - for zoom
+- the + and - keys for zoom
 - enter or space to select
 
 ### Key controls, zoom and vector map tiles
@@ -128,7 +128,7 @@ Some JavaScript libraries handle zoom slightly differently. Most  zoom the map w
 Use vector map tiles instead of static images.
 
 ### Remove or reduce the amount of JavaScript
-Provide the no script version of the map if JavaScript is unavailable to the user
+Provide the no script version of the map if JavaScript is unavailable to the user.
 
 
 ## Services with maps