Rename comment form textarea label to `Comment`

The current label is `Description` which is inaccurate. A user
types in a comment, not a description, to post in the discussion.

app/assets/javascripts/notes/components/comment_form.vue

@@ -363,7 +363,7 @@ export default {
                     data-qa-selector="comment_field"
                     data-testid="comment-field"
                     :data-supports-quick-actions="!glFeatures.tributeAutocomplete"
-                    :aria-label="__('Description')"
+                    :aria-label="__('Comment')"
                     :placeholder="__('Write a comment or drag your files here…')"
                     @keydown.up="editCurrentUserLastNote()"
                     @keydown.meta.enter="handleSave()"

changelogs/unreleased/cngo-rename-comment-form-textarea-label.yml

+---
+title: Rename comment form textarea label to `Comment`
+merge_request: 55088
+author:
+type: changed

spec/features/issues/gfm_autocomplete_spec.rb

@@ -209,16 +209,16 @@ RSpec.describe 'GFM autocomplete', :js do
 
     # Regression test for https://gitlab.com/gitlab-org/gitlab/-/issues/321925
     it 'shows username when pasting then pressing Enter' do
-      fill_in 'Description', with: "@#{user.username}\n"
+      fill_in 'Comment', with: "@#{user.username}\n"
 
-      expect(find_field('Description').value).to have_content "@#{user.username}"
+      expect(find_field('Comment').value).to have_content "@#{user.username}"
     end
 
     it 'does not show `@undefined` when pressing `@` then Enter' do
-      fill_in 'Description', with: "@\n"
+      fill_in 'Comment', with: "@\n"
 
-      expect(find_field('Description').value).to have_content "@"
-      expect(find_field('Description').value).not_to have_content "@undefined"
+      expect(find_field('Comment').value).to have_content "@"
+      expect(find_field('Comment').value).not_to have_content "@undefined"
     end
 
     it 'selects the first item for non-assignee dropdowns if a query is entered' do