Fix spelling of 5 'un' words in comments

Problem/Motivation

This is a child issue of #3265331: [meta] Fix missing hyphens for prefixes - Words starting with "un" that aims to address the incorrect usage of several words beginning with the prefix "un" in Drupal\Tests\path_alias\Unit\AliasManagerTest and other files. Specifically, this relates to the words "unpreloaded", "uninstallations", "unstripped", and "untranslatable"

  /**
   * Tests the getAliasByPath cache with an unpreloaded path with alias.
   *
   * @covers ::getAliasByPath
   * @covers ::writeCache
   */
  /**
   * Tests the getAliasByPath cache with an unpreloaded path without alias.
   *
   * @covers ::getAliasByPath
   * @covers ::writeCache
   */

Proposed resolution

Rework comments to remove the following words. There is a small set of words here but the remaining words with the 'un' prefix are used in code or in user facing text. git stat

1. undoable
2. unfieldable
3. ninstallation
4. uninstallations
5. unpublishes

Remaining tasks

Review
Commit

User interface changes

API changes

Data model changes

Release notes snippet