Update JavaDoc

Author: emmyzhou-db

databricks-sdk-java/src/main/java/com/databricks/sdk/core/oauth/EnvVarIDTokenSource.java

@@ -32,11 +32,8 @@ public EnvVarIDTokenSource(String envVarName, Environment env) {
    *
    * @param audience The intended recipient of the ID Token (unused in this implementation).
    * @return An {@link IDToken} containing the token value from the environment variable.
-   * @throws IllegalArgumentException if the environment variable name is null or empty, or the
-   *     environment is null.
+   * @throws IllegalArgumentException if the environment variable name is null or empty.
    * @throws DatabricksException if the environment variable is not set or is empty.
-   * @throws NullPointerException if the environment variable name is null.
-   * @throws ClassCastException if the environment variable name is not a String.
    */
   @Override
   public IDToken getIDToken(String audience) {