Fix the issues reported by phpcs

The issue summary should always describe what the issue is trying to fix and, in the case, of coding standards issues, show which command has been used, which arguments have been used, and which report that command shown.

Fix the issues reported by phpcs but still, there are some phpcs issues left.

The status is also for the issue summary that needs to be updated.

       // 2.x: this.majorVersion="2";this.minorVersion="1.3"
-      // 3.x: majorVersion:'3',minorVersion:'2.0.1'
+      // 3.x: majorVersion:'3',minorVersion:'2.0.1'.

I am not sure a period is necessary, given what those comments show.

+  $items['libraries-download'] = array[
+  'callback' => 'libraries_drush_download',
+  'description' => dt('Downloads a registered library into the libraries directory for the active site.'),
+  'arguments' => [
+  'name' => dt('The internal name of the registered library.'),
+  ],
+  ];

The first line causes a parsing error.
The other lines are not indented correctly.

 class AssetLibrary extends LibraryBase implements
-  AssetLibraryInterface,
-  LocalLibraryInterface,
-  RemoteLibraryInterface
-{
+    AssetLibraryInterface,
+    LocalLibraryInterface,
+    RemoteLibraryInterface {

The line indentation is wrong.

-   * \Drupal\libraries\ExternalLibrary\Remote\RemoteLibraryInterface::getRemoteUrl()
+   *   \Drupal\libraries\ExternalLibrary\Remote\RemoteLibraryInterface::getRemoteUrl()
    */

Probably that line should start with @see.

+  /**
+   *
+   */
   public function files() {

Documentation comments for methods need to describe the method, its parameters and its return value.

-          // $filepath = str_replace('index.php/', '', $filepath);
+          // $filepath = str_replace('index.php/', '', $filepath);.

No, a period is not added at the end of a line containing PHP code.

-      ]],
+      ],
+      ],

The indentation is wrong.

Issue summary updated.