docs: alphabetize (#666)

Author: benmccann

documentation/docs/20-commands/20-sv-add.md

@@ -27,6 +27,7 @@ You can select multiple space-separated add-ons from [the list below](#Official-
 
 <!-- TODO: it'd be nice for this to live on the "add-ons" page, but we first need svelte.dev to support making pages from headings -->
 
+- [`devtools-json`](devtools-json)
 - [`drizzle`](drizzle)
 - [`eslint`](eslint)
 - [`lucia`](lucia)
@@ -38,4 +39,3 @@ You can select multiple space-separated add-ons from [the list below](#Official-
 - [`sveltekit-adapter`](sveltekit-adapter)
 - [`tailwindcss`](tailwind)
 - [`vitest`](vitest)
-- [`devtools-json`](devtools-json)