code: public GetDocumentTextDetectionResult withWarnings(Warning... warnings) {
          if (this.warnings == null) {
              setWarnings(new java.util.ArrayList<Warning>(warnings.length));
          }
          for (Warning ele : warnings) {
              this.warnings.add(ele);
          }
          return this;
      }
docs: <p>
  A list of warnings that occurred during the document text-detection operation.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setWarnings(java.util.Collection)} or {@link #withWarnings(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param warnings
  A list of warnings that occurred during the document text-detection operation.
  @return Returns a reference to this object so that method calls can be chained together.