docs: correct ?text= OCR-search drift (no longer 501)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/routes/search/+page.ts

@@ -41,9 +41,9 @@ function parseWarnings(raw: string | null): ContentWarning[] {
  * - `?order=desc|asc` — only meaningful for chapters/mangas tabs.
  *   `desc` (most matches first) is the default.
  *
- * `?text=` is reserved for the planned OCR text-search input. The
- * backend rejects it with 501 + stable code
- * `text_search_not_yet_supported` today; the frontend never sets it.
+ * `?text=` drives OCR full-text search against the page OCR index (the
+ * active OCR backend populates it). A non-empty `text` (or an included
+ * content-warning) switches the page into content-search mode below.
  */
 export const load: PageLoad = async ({ url }) => {
     const tag = url.searchParams.get('tag');