fix: snakeCase to camelCase for getClaim param

Author: Arobce

src/content/docs/developer-tools/sdks/frontend/react-sdk.mdx

@@ -636,7 +636,7 @@ claim: string, tokenKey?: "accessToken" | "idToken"
 Usage:
 
 ```jsx
-getClaim("given_name", "idToken");
+getClaim("givenName", "idToken");
 ```
 
 Sample: