docs: Address PR review comments on remote browser page

Remove unnecessary --break-system-packages flag from pip install commands
and clarify that Browser Use comes pre-installed in the kernel-browser template.

Author: beran-t

docs/use-cases/remote-browser.mdx

@@ -76,7 +76,7 @@ const sandbox = await Sandbox.create('kernel-browser', {
 
 await sandbox.files.write('/home/user/app.py', FASTAPI_APP)
 await sandbox.commands.run(
-  'pip install --break-system-packages fastapi uvicorn',
+  'pip install fastapi uvicorn',
   { timeoutMs: 60_000 },
 )
 await sandbox.commands.run(
@@ -96,7 +96,7 @@ sandbox = Sandbox.create(
 
 sandbox.files.write("/home/user/app.py", FASTAPI_APP)
 sandbox.commands.run(
-    "pip install --break-system-packages fastapi uvicorn",
+    "pip install fastapi uvicorn",
     timeout=60,
 )
 sandbox.commands.run(
@@ -230,7 +230,7 @@ sandbox = Sandbox.create(
 </Step>
 
 <Step title="Write and run the agent">
-The agent script runs inside the sandbox. It creates a Kernel browser, connects Browser Use, and completes the task autonomously.
+The agent script runs inside the sandbox. Browser Use and its dependencies come pre-installed in the `kernel-browser` template. The script creates a Kernel browser, connects Browser Use, and completes the task autonomously.
 
 <CodeGroup>
 ```typescript JavaScript & TypeScript