Issue #1894382 by nick_schuch: fix misspelling of word indices in a few spots

core/modules/system/system.install

@@ -1540,8 +1540,8 @@ function system_update_8004() {
   // internationalization, keep it, but standardize the specification.
   // Otherwise, add the field.
   if (db_field_exists('file_managed', 'langcode')) {
-    // According to the documentation of db_change_field(), indeces using the
-    // field should be dropped first; if the contrib module created any indeces,
+    // According to the documentation of db_change_field(), indices using the
+    // field should be dropped first; if the contrib module created any indices,
     // it is its responsibility to drop them in an update function that runs
     // before this one, which it can enforce via hook_update_dependencies().
     db_change_field('file_managed', 'langcode', 'langcode', $langcode_field);

core/modules/taxonomy/taxonomy.install

@@ -225,9 +225,9 @@ function taxonomy_update_8001() {
     // internationalization, keep it, but standardize the specification.
     // Otherwise, add the field.
     if (db_field_exists($table, 'langcode')) {
-      // According to the documentation of db_change_field(), indeces using the
+      // According to the documentation of db_change_field(), indices using the
       // field should be dropped first; if the contrib module created any
-      // indeces, it is its responsibility to drop them in an update function
+      // indices, it is its responsibility to drop them in an update function
       // that runs before this one, which it can enforce via
       // hook_update_dependencies().
       db_change_field($table, 'langcode', 'langcode', $langcode_field);