Updating case of shortcut on Discussion view fixes VICE-577

Test plan
- Pull down change for testing
- Open a course with announcement or discussions
- Open an announcement or discussion
- Tab through page to see Shortcut announcement with ALT + F8 shortcut
- Confirm hidden text says ALT + F8 and not Shift + ?

Change-Id: I919226707dddad23a6be262580f1140da25419be
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/241560
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Drake Harper <drake.harper@instructure.com>
QA-Review: Drake Harper <drake.harper@instructure.com>
Product-Review: Drake Harper <drake.harper@instructure.com>

app/jsx/shared/__tests__/KeyboardShortcutModal.test.js

@@ -42,7 +42,7 @@ describe(KeyboardShortcutModal, () => {
     component.unmount()
   })
 
-  test('appears when alt + f8 is pressed', async () => {
+  test('appears when ALT + F8 is pressed', async () => {
     expect(document.querySelector('.keyboard_navigation')).toBeNull()
     const e = new Event('keydown')
     e.which = 119

app/views/discussion_topics/show.html.erb

@@ -64,7 +64,7 @@
       <div class="form-inline" style="overflow: visible;">
         <div id="keyboard-shortcut-modal-info" tabindex="0">
           <span class="accessibility-warning">
-            <%= t 'Press alt + F8 to see a list of keyboard shortcuts' %>
+            <%= t 'Press ALT + F8 to see a list of keyboard shortcuts' %>
           </span>
         </div>
         <div class="pull-right">

spec/coffeescripts/jsx/discussion_topics/DiscussionTopicKeyboardShortcutModalSpec.js

@@ -52,7 +52,7 @@ QUnit.module('DiscussionTopicKeyboardShortcutModal#render')
 test('renders shortcuts', async function() {
   const wrapper = mount(<DiscussionTopicKeyboardShortcutModal />)
 
-  // open the modal by pressing "alt + f8"
+  // open the modal by pressing "ALT + f8"
   const e = new Event('keydown')
   e.which = 119
   e.altKey = true