docs(input,searchbar): setFocus usage within overlays (#27142)

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## What is the current behavior?
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The `setFocus` method does not mention extra implementation details
required when working within an overlay.

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Issue URL: N/A


## What is the new behavior?
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this PR. -->

- Adds additional detail about how to use `setFocus()` when inside an
overlay
- Aligns the `ion-searchbar` documentation to match the `ion-input`
documentation

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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screenshots of how the component looks before and after the change. -->

core/src/components.d.ts

@@ -1270,7 +1270,7 @@ export namespace Components {
          */
         "required": boolean;
         /**
-          * Sets focus on the native `input` in `ion-input`. Use this method instead of the global `input.focus()`.  Developers who wish to focus an input when a page enters should call `setFocus()` in the `ionViewDidEnter()` lifecycle method.
+          * Sets focus on the native `input` in `ion-input`. Use this method instead of the global `input.focus()`.  Developers who wish to focus an input when a page enters should call `setFocus()` in the `ionViewDidEnter()` lifecycle method.  Developers who wish to focus an input when an overlay is presented should call `setFocus` after `didPresent` has resolved.
          */
         "setFocus": () => Promise<void>;
         /**
@@ -2583,7 +2583,7 @@ export namespace Components {
          */
         "searchIcon"?: string;
         /**
-          * Sets focus on the specified `ion-searchbar`. Use this method instead of the global `input.focus()`.
+          * Sets focus on the native `input` in `ion-searchbar`. Use this method instead of the global `input.focus()`.  Developers who wish to focus an input when a page enters should call `setFocus()` in the `ionViewDidEnter()` lifecycle method.  Developers who wish to focus an input when an overlay is presented should call `setFocus` after `didPresent` has resolved.
          */
         "setFocus": () => Promise<void>;
         /**

core/src/components/input/input.tsx

@@ -397,6 +397,9 @@ export class Input implements ComponentInterface {
    *
    * Developers who wish to focus an input when a page enters
    * should call `setFocus()` in the `ionViewDidEnter()` lifecycle method.
+   *
+   * Developers who wish to focus an input when an overlay is presented
+   * should call `setFocus` after `didPresent` has resolved.
    */
   @Method()
   async setFocus() {

core/src/components/searchbar/searchbar.tsx

@@ -243,8 +243,14 @@ export class Searchbar implements ComponentInterface {
   }
 
   /**
-   * Sets focus on the specified `ion-searchbar`. Use this method instead of the global
+   * Sets focus on the native `input` in `ion-searchbar`. Use this method instead of the global
    * `input.focus()`.
+   *
+   * Developers who wish to focus an input when a page enters
+   * should call `setFocus()` in the `ionViewDidEnter()` lifecycle method.
+   *
+   * Developers who wish to focus an input when an overlay is presented
+   * should call `setFocus` after `didPresent` has resolved.
    */
   @Method()
   async setFocus() {