chore: Remove warning from UserCredentials and ServiceAccounJwtAccessCredentials

Author: lqiu96

oauth2_http/java/com/google/auth/oauth2/ServiceAccountJwtAccessCredentials.java

@@ -227,13 +227,6 @@ static ServiceAccountJwtAccessCredentials fromPkcs8(
    * Returns credentials defined by a Service Account key file in JSON format from the Google
    * Developers Console.
    *
-   * <p>Important: If you accept a credential configuration (credential JSON/File/Stream) from an
-   * external source for authentication to Google Cloud Platform, you must validate it before
-   * providing it to any Google API or library. Providing an unvalidated credential configuration to
-   * Google APIs can compromise the security of your systems and data. For more information, refer
-   * to {@link <a
-   * href="https://cloud.google.com/docs/authentication/external/externally-sourced-credentials">documentation</a>}.
-   *
    * @param credentialsStream the stream with the credential definition.
    * @return the credential defined by the credentialsStream.
    * @throws IOException if the credential cannot be created from the stream.
@@ -247,13 +240,6 @@ public static ServiceAccountJwtAccessCredentials fromStream(InputStream credenti
    * Returns credentials defined by a Service Account key file in JSON format from the Google
    * Developers Console.
    *
-   * <p>Important: If you accept a credential configuration (credential JSON/File/Stream) from an
-   * external source for authentication to Google Cloud Platform, you must validate it before
-   * providing it to any Google API or library. Providing an unvalidated credential configuration to
-   * Google APIs can compromise the security of your systems and data. For more information, refer
-   * to {@link <a
-   * href="https://cloud.google.com/docs/authentication/external/externally-sourced-credentials">documentation</a>}.
-   *
    * @param credentialsStream the stream with the credential definition.
    * @param defaultAudience Audience to use if not provided by transport. May be null.
    * @return the credential defined by the credentialsStream.

oauth2_http/java/com/google/auth/oauth2/UserCredentials.java

@@ -138,13 +138,6 @@ static UserCredentials fromJson(Map<String, Object> json, HttpTransportFactory t
   /**
    * Returns credentials defined by a JSON file stream using the format supported by the Cloud SDK.
    *
-   * <p>Important: If you accept a credential configuration (credential JSON/File/Stream) from an
-   * external source for authentication to Google Cloud Platform, you must validate it before
-   * providing it to any Google API or library. Providing an unvalidated credential configuration to
-   * Google APIs can compromise the security of your systems and data. For more information, refer
-   * to {@link <a
-   * href="https://cloud.google.com/docs/authentication/external/externally-sourced-credentials">documentation</a>}.
-   *
    * @param credentialsStream the stream with the credential definition.
    * @return the credential defined by the credentialsStream.
    * @throws IOException if the credential cannot be created from the stream.
@@ -156,13 +149,6 @@ public static UserCredentials fromStream(InputStream credentialsStream) throws I
   /**
    * Returns credentials defined by a JSON file stream using the format supported by the Cloud SDK.
    *
-   * <p>Important: If you accept a credential configuration (credential JSON/File/Stream) from an
-   * external source for authentication to Google Cloud Platform, you must validate it before
-   * providing it to any Google API or library. Providing an unvalidated credential configuration to
-   * Google APIs can compromise the security of your systems and data. For more information, refer
-   * to {@link <a
-   * href="https://cloud.google.com/docs/authentication/external/externally-sourced-credentials">documentation</a>}.
-   *
    * @param credentialsStream the stream with the credential definition.
    * @param transportFactory HTTP transport factory, creates the transport used to get access
    *     tokens.