Add browser page close notice (#1270)

Author: inancgumus

src/data/markdown/docs/02 javascript api/07 k6-experimental/01 browser.md

@@ -38,7 +38,7 @@ The browser module is the entry point for all your tests, and it is what interac
 | [browser.context()](/javascript-api/k6-experimental/browser/context)                        | Returns the current [BrowserContext](/javascript-api/k6-experimental/browser/browsercontext/).                                                        |
 | [browser.isConnected](/javascript-api/k6-experimental/browser/isconnected) <BWIPT id="453"/>  | Indicates whether the [CDP](https://chromedevtools.github.io/devtools-protocol/) connection to the browser process is active or not.                  |
 | [browser.newContext([options])](/javascript-api/k6-experimental/browser/newcontext/) <BWIPT id="455"/> | Creates and returns a new [BrowserContext](/javascript-api/k6-experimental/browser/browsercontext/).                                                             |
-| [browser.newPage([options])](/javascript-api/k6-experimental/browser/newpage)  <BWIPT id="455"/>       | Creates a new [Page](/javascript-api/k6-experimental/browser/page/) in a new [BrowserContext](/javascript-api/k6-experimental/browser/browsercontext/) and returns the page. |
+| [browser.newPage([options])](/javascript-api/k6-experimental/browser/newpage)  <BWIPT id="455"/>       | Creates a new [Page](/javascript-api/k6-experimental/browser/page/) in a new [BrowserContext](/javascript-api/k6-experimental/browser/browsercontext/) and returns the page. Pages that have been opened ought to be closed using [`Page.close`](/javascript-api/k6-experimental/browser/page/close/). Pages left open could potentially distort the results of Web Vital metrics. |
 | [browser.version()](/javascript-api/k6-experimental/browser/version/)                          | Returns the browser application's version.                                                                                                            |
 
 ### Example

src/data/markdown/docs/02 javascript api/07 k6-experimental/01 browser/newpage--options--.md

@@ -11,6 +11,12 @@ A 1-to-1 mapping between [Browser](/javascript-api/k6-experimental/browser) and
 
 </Blockquote>
 
+<Blockquote mod="attention" title="">
+
+Pages that have been opened ought to be closed using [`Page.close`](/javascript-api/k6-experimental/browser/page/close/). Pages left open could potentially distort the results of Web Vital metrics.
+
+</Blockquote>
+
 <TableWithNestedRows>
 
 | Parameter                                   | Type    | Default                          | Description                                                                                                                                                                                                                                       |

src/data/markdown/translated-guides/en/03 Using k6 browser/02 Running browser tests.md

@@ -59,7 +59,9 @@ To run a simple local script:
 
   The preceding code imports the `browser` ([the browser module](/javascript-api/k6-experimental/browser)), and uses its `newPage` method to open a new page.
 
-  After getting the page, you can interact with it using the [Page](/javascript-api/k6-experimental/browser/page) methods. This example visits a test URL and takes a screenshot of the page. Afterwards, it closes the page.
+  After getting the page, you can interact with it using the [Page](/javascript-api/k6-experimental/browser/page) methods. This example visits a test URL and takes a screenshot of the page.
+  
+  Subsequently, the page is closed. This allows for the freeing up of allocated resources and enables the accurate calculation of [Web Vital metrics](/using-k6-browser/browser-metrics/).
 
   <Blockquote mod="note" title="">