Fix issue description list item styling

What does this MR do and why?

This MR :

1. Fixes wrong vertical alignment for list items
2. Fixes indentation so it only happens on multi-paragraph list items.

The bad alignment of checkboxes and labels was caused by vertical-align: top which we need for aligning the inside bullet point, so we need to exclude checkboxes and labels from the selector.

Previous related MRs: !85936 (merged) and !87904 (merged)

Changelog: fixed

Markdown used for testing

• A new journey map using Geo Mural board
• Follow up issues of UX/UI improvements and documentation improvements
  • Find and fix the inconsistencies in the docs and the UIs.
• Latest team discussion (Private on YouTube) https://www.youtube.com/watch?v=DQDkjwB3dx0

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text

1. multiline

   blockquote

   codeblock

   multi
   line
   codeblock

   emphasis

   header

   header 2

   ![img][img.jpg]

   
   

   link

   #F00

   👍

   • addition 2
   • addition 1
   • deletion 3
   • deletion 4

   a^2+b^2=c^2

   • Completed task
   • Incomplete task
     • Sub-task 1
     • Sub-task 2
     • Sub-task 3
   1. Completed task
   2. Incomplete task
      1. Sub-task 1
      2. Sub-task 2

   @root

   #1 (closed)

   ~Afternix

   Sample Video

   Sample Audio

   

   i am code

   Definition list

   Is something people use sometimes.

   Markdown in HTML

   Does *not* work **very** well. HTML tags do work, in most cases.

   Click this to collapse/fold.

   These details remain hidden until expanded.

   PASTE LOGS HERE

   Tables	Are	Cool
   col 3 is	right-aligned	$1600
   col 2 is	centered	$12
   zebra stripes	are neat	$1

   ---

List A

• Blah
• Another thing

List A with space

• Blah

• Another thing

Screenshots or screen recordings

before	after

How to set up and validate locally

1. Visit an issue page such as http://127.0.0.1:3000/h5bp/html5-boilerplate/-/issues/1
2. Update the issue description then test the MR

MR acceptance checklist

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