Update API Readme to indicate renderWhenVisible function is optional (

#7285)

* using less normative languange

* grammar

API.md

@@ -1315,7 +1315,7 @@ The show function is responsible for the rendering of a view. An [Intersection O
 
 ### Implementing Visibility-Based Rendering
 
-The `renderWhenVisible` function is passed to the show function as a required part of the `viewOptions` object. This function should be used for all rendering logic that would otherwise be executed within a `requestAnimationFrame` call. When called, `renderWhenVisible` will either execute the provided function immediately (via `requestAnimationFrame`) if the view is currently visible, or defer its execution until the view becomes visible.
+The `renderWhenVisible` function is passed to the show function as part of the `viewOptions` object. This function can be used for all rendering logic that would otherwise be executed within a `requestAnimationFrame` call. When called, `renderWhenVisible` will either execute the provided function immediately (via `requestAnimationFrame`) if the view is currently visible, or defer its execution until the view becomes visible.
 
 Additionally, `renderWhenVisible` returns a boolean value indicating whether the provided function was executed immediately (`true`) or deferred (`false`).
 
@@ -1325,7 +1325,7 @@ Here’s the signature for the show function:
 
   * `element` (HTMLElement) - The DOM element where the view should be rendered.
   * `isEditing` (boolean) - Indicates whether the view is in editing mode.
-  * `viewOptions` (Object) - A required object with configuration options for the view, including:
+  * `viewOptions` (Object) - An object with configuration options for the view, including:
     * `renderWhenVisible` (Function) - This function wraps the `requestAnimationFrame` and only triggers the provided render logic when the view is visible in the viewport.
 
 ### Example