doc: fix docs style in util.md

Summary
  + L582: Cell should be padded
  + L589: Cell should be padded
  + L590: Cell should be padded
  + L600: Cell should be padded
  + L622: Cell should be padded

PR-URL: https://github.com/nodejs/node/pull/14711
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

doc/api/util.md

@@ -579,15 +579,15 @@ with ICU and using the full ICU data (see [Internationalization][]).
 | Encoding     | Aliases                           |
 | -----------  | --------------------------------- |
 | `'utf-8'`    | `'unicode-1-1-utf-8'`, `'utf8'`   |
-| `'utf-16le'`| `'utf-16'`                        |
+| `'utf-16le'` | `'utf-16'`                        |
 
 #### Encodings Supported by Default (With ICU)
 
 | Encoding     | Aliases                           |
 | -----------  | --------------------------------- |
 | `'utf-8'`    | `'unicode-1-1-utf-8'`, `'utf8'`   |
-| `'utf-16le'`| `'utf-16'`                        |
-| `'utf-16be'`|                                   |
+| `'utf-16le'` | `'utf-16'`                        |
+| `'utf-16be'` |                                   |
 
 #### Encodings Requiring Full ICU Data
 
@@ -597,7 +597,7 @@ with ICU and using the full ICU data (see [Internationalization][]).
 | `'iso-8859-2'`     | `'csisolatin2'`, `'iso-ir-101'`, `'iso8859-2'`, `'iso88592'`, `'iso_8859-2'`, `'iso_8859-2:1987'`, `'l2'`, `'latin2'`  |
 | `'iso-8859-3'`     | `'csisolatin3'`, `'iso-ir-109'`, `'iso8859-3'`, `'iso88593'`, `'iso_8859-3'`, `'iso_8859-3:1988'`, `'l3'`, `'latin3'`  |
 | `'iso-8859-4'`     | `'csisolatin4'`, `'iso-ir-110'`, `'iso8859-4'`, `'iso88594'`, `'iso_8859-4'`, `'iso_8859-4:1988'`, `'l4'`, `'latin4'`  |
-| `'iso-8859-5'`    | `'csisolatincyrillic'`, `'cyrillic'`, `'iso-ir-144'`, `'iso8859-5'`, `'iso88595'`, `'iso_8859-5'`, `'iso_8859-5:1988'`|
+| `'iso-8859-5'`     | `'csisolatincyrillic'`, `'cyrillic'`, `'iso-ir-144'`, `'iso8859-5'`, `'iso88595'`, `'iso_8859-5'`, `'iso_8859-5:1988'` |
 | `'iso-8859-6'`     | `'arabic'`, `'asmo-708'`, `'csiso88596e'`, `'csiso88596i'`, `'csisolatinarabic'`, `'ecma-114'`, `'iso-8859-6-e'`, `'iso-8859-6-i'`, `'iso-ir-127'`, `'iso8859-6'`, `'iso88596'`, `'iso_8859-6'`, `'iso_8859-6:1987'` |
 | `'iso-8859-7'`     | `'csisolatingreek'`, `'ecma-118'`, `'elot_928'`, `'greek'`, `'greek8'`, `'iso-ir-126'`, `'iso8859-7'`, `'iso88597'`, `'iso_8859-7'`, `'iso_8859-7:1987'`, `'sun_eu_greek'` |
 | `'iso-8859-8'`     | `'csiso88598e'`, `'csisolatinhebrew'`, `'hebrew'`, `'iso-8859-8-e'`, `'iso-ir-138'`, `'iso8859-8'`, `'iso88598'`, `'iso_8859-8'`, `'iso_8859-8:1988'`, `'visual'` |
@@ -619,7 +619,7 @@ with ICU and using the full ICU data (see [Internationalization][]).
 | `'windows-1256'`   | `'cp1256'`, `'x-cp1256'` |
 | `'windows-1257'`   | `'cp1257'`, `'x-cp1257'` |
 | `'windows-1258'`   | `'cp1258'`, `'x-cp1258'` |
-| `'x-mac-cyrillic'`| `'x-mac-ukrainian'` |
+| `'x-mac-cyrillic'` | `'x-mac-ukrainian'` |
 | `'gbk'`            | `'chinese'`, `'csgb2312'`, `'csiso58gb231280'`, `'gb2312'`, `'gb_2312'`, `'gb_2312-80'`, `'iso-ir-58'`, `'x-gbk'` |
 | `'gb18030'`        | |
 | `'big5'`           | `'big5-hkscs'`, `'cn-big5'`, `'csbig5'`, `'x-x-big5'` |