Add markdown divider between module doc and module type in hover information

[mediremi]

I've made hover information for modules more consistent with type hover information by adding a Markdown.divider between a module's doc string and its contents.

Thanks to the divider, it's easier to tell where a doctring ends and where the module type definition starts:

/**
 My module with a doc comment.

 ## Examples
 ```rescript
 Foo.bar()
 Foo.baz()
 \```
*/
module type Foo = {
  let bar: unit => unit
  let baz: unit => unit
}

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commit: 9ba2bb6

[nojaf]

Too bad this doesn't come with some padding.

[zth]

IIRC I faked some padding with empty markdown (or was it code?) blocks. Maybe worth trying? Might still be some code in there for that.

[mediremi]

I've added some spacing with Markdown.spacing 👍

[Copilot]

Pull Request Overview

This PR improves the visual separation in module hover information by adding a markdown divider between a module's documentation and its type definition, making it consistent with how type hover information is displayed.

• Adds Markdown.divider and Markdown.spacing between module docstrings and module type definitions
• Updates test expectations to reflect the new formatting with dividers
• Improves readability by clearly separating documentation from type information

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
analysis/src/Hover.ml	Adds markdown divider and spacing after module docstrings
tests/analysis_tests/tests/src/expected/Hover.res.txt	Updates test expectations to include new divider formatting
CHANGELOG.md	Documents the new feature addition

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