Update usage-dictionary.mdx

Added "generative AI" to Usage dictionary.

src/content/docs/style-guide/word-choice/usage-dictionary.mdx

@@ -457,6 +457,13 @@ E words are words that use `e` as a shorthand for electronic, like ebook, ecomme
     Whether used as an adjective or a noun, this is one word. See also [`backend`](#backend).
   </Collapser>
 
+<Collapser
+    id="generative AI"
+    title="generative AI"
+  >
+    Spell out: generative AI. When space does not permit, GenAI is acceptable. Generative AI is an application of machine learning that can create a variety of content, including as text, images, or audio from natural language prompts. 
+  </Collapser>
+
 <Collapser
     id="home page"
     title="home page"