Fix: phpcs --standard=Drupal error.

$ phpcs --standard=Drupal --extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml views_display_union/

FILE: C:\xampp\htdocs\contribution\web\modules\contrib\views_display_union\README.txt
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FOUND 1 ERROR AND 1 WARNING AFFECTING 2 LINES
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3 | WARNING | [ ] Line exceeds 80 characters; contains 272 characters
6 | ERROR | [x] Expected 1 newline at end of file; 0 found
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: C:\xampp\htdocs\contribution\web\modules\contrib\views_display_union\src\Plugin\views\display\Union.php
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FOUND 3 ERRORS AFFECTING 3 LINES
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111 | ERROR | [x] Missing function doc comment
149 | ERROR | [ ] Missing short description in doc comment
209 | ERROR | [x] Expected 1 newline at end of file; 0 found
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PHPCBF CAN FIX THE 2 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: C:\xampp\htdocs\contribution\web\modules\contrib\views_display_union\views_display_union.module
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FOUND 5 ERRORS AFFECTING 5 LINES
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34 | ERROR | [x] Expected 1 space after FUNCTION keyword; 0 found
71 | ERROR | [x] Expected 1 space after FUNCTION keyword; 0 found
78 | ERROR | [x] Closing parenthesis of array declaration must be on a new line
85 | ERROR | [x] Expected 1 space after FUNCTION keyword; 0 found
116 | ERROR | [x] Expected 1 newline at end of file; 0 found
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PHPCBF CAN FIX THE 5 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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Time: 300ms; Memory: 10MB