Merge pull request #4997 from IgniteUI/igxColumnComponent-Formatter-Code-Snippet

Updated Column Formatter API doc

Author: kdinev

projects/igniteui-angular/src/lib/grids/column.component.ts

@@ -388,9 +388,22 @@ export class IgxColumnComponent implements AfterContentInit {
         return this.grid.columns.indexOf(this);
     }
     /**
-     * Gets formatter for the column.
+     * When autogenerating columns, the formatter is used to format the display of the column data
+     * without modifying the underlying bound values.
+     *
+     * In this example, we check to see if the column name is Salary, and then provide a method as the column formatter
+     * to format the value into a currency string.
+     *
      * ```typescript
-     * let columnFormatter = this.column.formatter;
+     * onColumnInit(column: IgxColumnComponent) {
+     *   if (column.field == "Salary") {
+     *     column.formatter = (salary => this.format(salary));
+     *   }
+     * }
+     *
+     * format(value: number) : string {
+     *   return formatCurrency(value, "en-us", "$");
+     * }
      * ```
      * @memberof IgxColumnComponent
      */