fix(geocoding-demo): change placeholders to values

I was running through tests clicking each button expecting requests to work
however only the
findAddressCandidate method works with empty input
all others throw errors.

AFFECTS PACKAGES:
@esri/arcgis-rest-geocoder
@esri/arcgis-rest-geocoder-vanilla

demos/geocoder/index.html

@@ -20,15 +20,15 @@ <h1>get to geocodin!</h1>
         </p>
 
         <p>
-            <input id="geocodeInput" placeholder="123 main st"></input>
+            <input id="geocodeInput" value="123 main st"></input>
             <button class="btn" id="geocode" role="button">geocode an address</button>
         <p>
-            <input id="suggestInput" placeholder="World Tr"></input>
+            <input id="suggestInput" value="World Tr"></input>
             <button class="btn" id="suggest" role="button">get address suggestion</button>
         </p>
 
         <p>
-            <input id="reverseInput" placeholder="{x:-118,y:34}"></input>
+            <input id="reverseInput" value="{x:-118,y:34}"></input>
             <button class="btn" id="reverse" role="button">determine address</button>
         </p>
 
@@ -81,6 +81,7 @@ <h1>get to geocodin!</h1>
 var suggestBtn = document.getElementById('suggest');
 
 suggestBtn.addEventListener('click', function (e) {
+    console.log(document.getElementById("suggestInput").value);
     arcgisRest.suggest(document.getElementById("suggestInput").value)
     .then((response) => {
         console.log("suggest", response);

packages/arcgis-rest-geocoder/src/geocoder.ts

@@ -65,7 +65,7 @@ export interface IGeocodeParams extends IParams {
   /**
    * You can create an autocomplete experience by making a call to suggest with partial text and then passing through the magicKey and complete address that are returned to geocode.
    * ```js
-   * import { suggest, geocode } from '@esri/arcgis-geocoder'; 
+   * import { suggest, geocode } from '@esri/arcgis-geocoder';
    * suggest("LAX")
    *   .then((response) => {
    *     response.suggestions[2].magicKey; // =>  "dHA9MCNsb2M9Mjk3ODc2MCNsbmc9MzMjcGw9ODkxNDg4I2xicz0xNDoxNDc4MTI1MA=="
@@ -233,7 +233,7 @@ export function suggest(
  *   .then((response) => {
  *     response.address.PlaceName; // => "LA Airport"
  *   });
- * 
+ *
  * // or
  * reverseGeocode({ long: -118.409, lat: 33.943 })
  * reverseGeocode({ latitude: 33.943, latitude: -118.409 })