我正在阅读GitHub上的一些@angular/cdk代码，我想知道这个“@docs-private”注解的含义。
https://github.com/angular/components/blob/main/src/cdk/table/row.ts

* Base class for the CdkHeaderRowDef and CdkRowDef that handles checking their columns inputs
 * for changes and notifying the table.
 */
@Directive()
export abstract class BaseRowDef implements OnChanges {
  /** The columns to be displayed on this row. */
  columns: Iterable<string>;

  /** Differ used to check if any changes were made to the columns. */
  protected _columnsDiffer: IterableDiffer<any>;

  constructor(
    /** @docs-private */ public template: TemplateRef<any>,
    protected _differs: IterableDiffers,
  ) {}

  ngOnChanges(changes: SimpleChanges): void {
    // Create a new columns differ if one does not yet exist. Initialize it based on initial value
    // of the columns property or an empty array if none is provided.
    if (!this._columnsDiffer) {
      const columns = (changes['columns'] && changes['columns'].currentValue) || [];
      this._columnsDiffer = this._differs.find(columns).create();
      this._columnsDiffer.diff(columns);
    }
  }```