docs: update fingerprint settings to reflect the new session create configu… (#1073)

…ration settings

# why

Updated docs to match the new fingerprint params in the Browserbase docs
here:
https://docs.browserbase.com/guides/stealth-customization#customization-options

# what changed

Update browser configuration docs to reflect the docs changes. 

# test plan

Author: Kylejeong2

docs/configuration/browser.mdx

@@ -124,17 +124,11 @@ stagehand = Stagehand(
           blockAds: true,
           solveCaptchas: true,
           recordSession: false,
+          os: "windows", // Valid: "windows" | "mac" | "linux" | "mobile" | "tablet"
           viewport: {
             width: 1920,
             height: 1080,
           },
-          fingerprint: {
-            browsers: ["chrome", "edge"],
-            devices: ["desktop"],
-            operatingSystems: ["windows", "macos"],
-            locales: ["en-US", "en-GB"],
-            httpVersion: 2,
-          },
         },
         userMetadata: {
           userId: "automation-user-123",
@@ -159,17 +153,11 @@ stagehand = Stagehand(
                 "block_ads": True,
                 "solve_captchas": True,
                 "record_session": False,
+                "os": "windows",  # "windows" | "mac" | "linux" | "mobile" | "tablet"
                 "viewport": {
                     "width": 1920,
                     "height": 1080,
                 },
-                "fingerprint": {
-                    "browsers": ["chrome", "edge"],
-                    "devices": ["desktop"],
-                    "operating_systems": ["windows", "macos"],
-                    "locales": ["en-US", "en-GB"],
-                    "http_version": 2,
-                },
             },
             "user_metadata": {
                 "user_id": "automation-user-123",