Markdown newline behaviour

What this post added

This post proposes a change to GitLab's Markdown rendering to align with the official Markdown specification, specifically regarding newline behavior. It advocates for rendering line breaks only when a line ends with two or more spaces, while paragraphs remain separated by blank lines. The post also highlights that this change will be applied uniformly across all Markdown usage within GitLab, including issues and merge requests, to maintain a consistent GitLab Flavored Markdown experience.