Issue #3138721 by sja112, dww: Fix "neccessary" typos in core

(cherry picked from commit 57f45c7d)

core/profiles/demo_umami/themes/umami/umami.theme

@@ -157,7 +157,7 @@ function umami_preprocess_image_widget(&$variables) {
  * Implements template_preprocess_links().
  *
  * This makes it so array keys of #links items are added as a class. This
- * functionality was removed in Drupal 8.1, but still neccessary in some
+ * functionality was removed in Drupal 8.1, but still necessary in some
  * instances.
  *
  * @todo remove in https://drupal.org/node/3120962

core/themes/bartik/bartik.theme

@@ -183,7 +183,7 @@ function bartik_preprocess_image_widget(&$variables) {
  * Implements template_preprocess_links().
  *
  * This makes it so array keys of #links items are added as a class. This
- * functionality was removed in Drupal 8.1, but still neccessary in some
+ * functionality was removed in Drupal 8.1, but still necessary in some
  * instances.
  *
  * @todo remove in https://drupal.org/node/3120962

core/themes/claro/claro.theme

@@ -415,7 +415,7 @@ function claro_preprocess_links(&$variables) {
   }
 
   // This makes it so array keys of #links items are added as a class. This
-  // functionality was removed in Drupal 8.1, but still neccessary in some
+  // functionality was removed in Drupal 8.1, but still necessary in some
   // instances.
   // @todo remove in https://drupal.org/node/3120962
   if (!empty($variables['links'])) {

core/themes/seven/seven.theme

@@ -451,7 +451,7 @@ function seven_preprocess_update_version(array &$variables) {
  * Implements template_preprocess_links().
  *
  * This makes it so array keys of #links items are added as a class. This
- * functionality was removed in Drupal 8.1, but still neccessary in some
+ * functionality was removed in Drupal 8.1, but still necessary in some
  * instances.
  *
  * @todo remove in https://drupal.org/node/3120962