Update to browserContext -- one word

Apply suggestion from @inancgumus

Co-authored-by: Inanc Gumus <inanc.gumus@grafana.com>

Author: ankur22

docs/sources/k6/v1.3.x/using-k6-browser/migrate-from-playwright-to-k6.md

@@ -417,7 +417,7 @@ const bc1 = await browser.newContext();
 const bc2 = await browser.newContext();
 ```
 
-To fix this, close the existing `browserContext` before creating a new one.
+To fix this, close the existing browser context before creating a new one.
 
 ## Hybrid tests