docs: address Vale linting feedback

- Define WCAG acronym on first use (Web Content Accessibility Guidelines)
- Remove adverb "quickly" from search section
- Change "is not" to "isn't" for consistency

Co-Authored-By: Chris McDonnell <[email protected]>

Author: devin-ai-integration[bot]

fern/products/docs/pages/getting-started/accessibility.mdx

@@ -1,7 +1,7 @@
 ---
 title: "Accessibility and keyboard shortcuts"
 subtitle: "Navigate and use Fern docs with keyboard shortcuts and accessibility features"
-description: "Learn about keyboard shortcuts and accessibility features in Fern documentation, including navigation shortcuts, search commands, and WCAG 2.1 AA color contrast enforcement."
+description: "Learn about keyboard shortcuts and accessibility features in Fern documentation, including navigation shortcuts, search commands, and Web Content Accessibility Guidelines (WCAG) 2.1 AA color contrast enforcement."
 ---
 
 Fern docs are designed to be accessible and keyboard-friendly, supporting navigation and interaction without requiring a mouse. This page outlines the keyboard shortcuts and accessibility features available in Fern documentation.
@@ -17,10 +17,10 @@ Navigate between previous and next pages in your documentation using keyboard sh
 
 ### Search
 
-Open the search dialog to quickly find content in your documentation:
+Open the search dialog to find content in your documentation:
 
 - **Command + K** (macOS) or **Ctrl + K** (Windows/Linux): Open search dialog
-- **/** (forward slash): Open search dialog when focus is not in a text input field
+- **/** (forward slash): Open search dialog when focus isn't in a text input field
   - Note: The `/` shortcut won't work when typing in an input field, textarea, or contenteditable element
 
 Once the search dialog is open: