typo fixed

Author: bikrant

demo/src/assets/docs/extensions/fixedcolumns/source-ts.md

@@ -7,7 +7,6 @@ import { Component, OnInit } from '@angular/core';
 })
 export class SelectExtensionComponent implements OnInit {
 
-  // Must be declared as "any", not as "DataTables.Settings"
   // Must be declared as "any", not as "DataTables.Settings"
   dtOptions: any = {};