Add comment about the usage of the input field in the statistics page (#3394) (#3398)

* Add comment about the usage of the input field in the statistics page (#3394)

* Fix formatting issues (#3394)

* Update ts/routes/graphs/RangeBox.svelte

Co-authored-by: Mike Hardy <github@mikehardy.net>

* Update ts/routes/graphs/RangeBox.svelte

Co-authored-by: Mike Hardy <github@mikehardy.net>

---------

Co-authored-by: Damien Elmes <dae@users.noreply.github.com>
Co-authored-by: Mike Hardy <github@mikehardy.net>

CONTRIBUTORS

@@ -189,6 +189,7 @@ Dillon Baldwin <https://github.com/DillBal>
 Voczi <https://github.com/voczi>
 Ben Nguyen <105088397+bpnguyen107@users.noreply.github.com>  
 Themis Demetriades <themis100@outlook.com>
+Luke Bartholomew <lukesbart@icloud.com>
 Gregory Abrasaldo <degeemon@gmail.com>
 Taylor Obyen <https://github.com/taylorobyen>
 

ts/routes/graphs/RangeBox.svelte

@@ -83,8 +83,11 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
             {collection}
         </label>
 
+        <!-- This form is an external API and care should be taken when changed -
+	other clients e.g. AnkiDroid programmatically update this form by id -->
         <input
             type="text"
+            id="statisticsSearchText"
             bind:value={displayedSearch}
             on:change={updateSearch}
             on:focus={() => {