docs: fix typo (#2769)

docs/content/3.docs/2.directory-structure/5.composables.md

@@ -23,7 +23,7 @@ Example: (using default export)
 ```js [composables/use-foo.ts or composables/useFoo.ts]
 import { useState } from '#app'
 
-// It will be available as useFoo() (pascalCase of file name without extension)
+// It will be available as useFoo() (camelCase of file name without extension)
 export default function () {
   return useState('foo', () => 'bar')
 }