DevTools: update search-across-all-files placeholder tip

Source/devtools/front_end/sources/AdvancedSearchView.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  */
 WebInspector.AdvancedSearchView = function()
 {
     WebInspector.VBox.call(this, true);
     this.setMinimumSize(0, 40);
     this.registerRequiredCSS("sources/sourcesSearch.css");
 
     this._searchId = 0;
 
     this.contentElement.classList.add("search-view");
 
     this._searchPanelElement = this.contentElement.createChild("div", "search-drawer-header");
     this._searchPanelElement.addEventListener("keydown", this._onKeyDown.bind(this), false);
 
     this._searchResultsElement = this.contentElement.createChild("div");
     this._searchResultsElement.className = "search-results";
 
     this._search = WebInspector.HistoryInput.create();
     this._searchPanelElement.appendChild(this._search);
-    this._search.placeholder = WebInspector.UIString("Use 'file:' to define search scope");
+    this._search.placeholder = WebInspector.UIString("Enter query, use `file:` to filter by path");
     this._search.setAttribute("type", "text");
     this._search.classList.add("search-config-search");
     this._search.setAttribute("results", "0");
     this._search.setAttribute("size", 30);
 
     this._ignoreCaseLabel = createCheckboxLabel(WebInspector.UIString("Ignore case"));
     this._ignoreCaseLabel.classList.add("search-config-label");
     this._searchPanelElement.appendChild(this._ignoreCaseLabel);
     this._ignoreCaseCheckbox = this._ignoreCaseLabel.checkboxElement;
     this._ignoreCaseCheckbox.classList.add("search-config-checkbox");
@@ skipping 360 matching lines @@
     performIndexing: function(progress) { },
 
     stopSearch: function() { },
 
     /**
      * @param {!WebInspector.ProjectSearchConfig} searchConfig
      * @return {!WebInspector.SearchResultsPane}
      */
     createSearchResultsPane: function(searchConfig) { }
 }