[Documentation] A11y refresh.

PiperOrigin-RevId: 353629654

Author: nickrout

docs/components/Checkbox.md

@@ -18,7 +18,9 @@ Use checkboxes to:
 *   Present a list containing sub-selections
 *   Turn an item on or off in a desktop environment
 
-![Checkbox hero example for menu options](assets/checkbox/checkbox_hero.png)
+![Checkbox hero: "Meal options" header, "Additions" checkbox, "Pickles"
+"Lettuce" "Tomato" checkboxes with “Lettuce”
+checked](assets/checkbox/checkbox_hero.png)
 
 **Contents**
 
@@ -178,7 +180,8 @@ API and source code:
 
 The following example shows a checkbox with Material Theming.
 
-!["Checkbox theming with pink and brown colors"](assets/checkbox/checkbox_theming.png)
+!["5 checkboxes with brown text and box outlines, checkbox 1 is selected box
+with pink fill and white checkmark"](assets/checkbox/checkbox_theming.png)
 
 #### Implementing checkbox theming
 

docs/components/Menu.md

@@ -116,7 +116,8 @@ API and source code:
 
 The following example shows an overflow menu.
 
-![White menu container on top of purple menu bar](assets/menu/menus_overflow.png)
+![Composite image: purple "Menus" bar, and purple "Menus" bar with white menu
+and 3 options](assets/menu/menus_overflow.png)
 
 In code:
 
@@ -682,8 +683,8 @@ API and source code:
 The following example shows filled and outlined exposed dropdown menu types with
 Material Theming.
 
-![Two examples of a 3-option white menu container below a "Show menu" button:
-button 1 is grey,, button 2 has a pink
+![Composite image of "Show menu" button and options: gray button with pink
+underline, and white button with pink
 outline](assets/menu/menus_exposed_dropdown_theming.png)
 
 ### Implementing exposed dropdown menu theming

docs/components/NavigationDrawer.md

@@ -12,7 +12,7 @@ path: /catalog/navigation-drawer/
 [Navigation drawers](https://material.io/components/navigation-drawer) provide
 access to destinations in your app.
 
-![Hero navigation drawer image](assets/navigationdrawer/NavDrawer-hero.png)
+![Nav drawer hero with profile pic, username, email, and user account options](assets/navigationdrawer/NavDrawer-hero.png)
 
 **Contents**
 
@@ -48,7 +48,7 @@ navigation drawer type and parent `ViewGroup`._
 
 ### Adding a menu
 
-![Basic navigation drawer image](assets/navigationdrawer/navigation_drawer_basic.png)
+![Nav drawer with 3 menu items](assets/navigationdrawer/navigation_drawer_basic.png)
 
 In the layout: