message: add example in how to guide of Header without access to metadata
diff: @@ -185,6 +185,20 @@ directory at `packages/app/src/components/techdocs`, and import and use it in
  />
  ```
  +And if your Header do not need access to specific metadata, you can just use
  +something like:
  +
  +```tsx
  +<Route
  + path="/docs/:namespace/:kind/:name/*"
  + element={
  + <TechDocsReaderPage>
  + {() => <Header type="documentation" title="Custom Header" />}
  + </TechDocsReaderPage>
  + }
  +/>
  +```
  +
  ### Without Search
  By default, the TechDocsReaderPage includes a in-context SearchBar where you can
  