docs: fix double code snippets (#21027)

Fixes https://github.com/microsoft/playwright/pull/20908

docs/src/browsers.md

@@ -103,34 +103,18 @@ them using Playwright command line tool:
 npx playwright install msedge
 ```
 
-```powershell lang=js
-npx playwright install msedge
-```
-
 ```bash lang=python
 playwright install msedge
 ```
 
-```powershell lang=python
-playwright install msedge
-```
-
 ```bash lang=csharp
 pwsh bin/Debug/netX/playwright.ps1 install msedge
 ```
 
-```powershell lang=csharp
-pwsh bin/Debug/netX/playwright.ps1 install msedge
-```
-
 ```batch lang=java
 mvn exec:java -e -D exec.mainClass=com.microsoft.playwright.CLI -D exec.args="install msedge"
 ```
 
-```powershell lang=java
-mvn exec:java -e -D exec.mainClass=com.microsoft.playwright.CLI -D exec.args="install msedge"
-```
-
 Run with `--help` option to see full list of the browsers that can be installed this way.
 
 :::warning

docs/src/release-notes-js.md

@@ -69,7 +69,7 @@ import LiteYouTube from '@site/src/components/LiteYouTube';
 - Official [docker images](./docker.md) now include Node 18 instead of Node 16.
 
 
-## ⚠️ Breaking change in component tests
+### ⚠️ Breaking change in component tests
 
 Note: **component tests only**, does not affect end-to-end tests.