Method docstrings are not visually separated

[abhro]

When using the "Live Docs" feature, the different methods for a function are not separated, and it's not always clear where the docs for one method starts and another begins.

The following example is created after importing DataFrames.jl in a blank notebook and looking up help for Base.ndims:

Method signatures are usually a good indicator of a docstring starting, but since the docstrings can also end with examples, it's not easy to visually search through the doc box to find the right method.

In contrast, Documenter.jl uses a thin line to separate method docs, which make it (at least a little) easier. Image taken from https://dataframes.juliadata.org/stable/lib/functions/#Base.ndims:

The issue is also visible in the cell renders, i.e. when you're defining multiple methods each with their own docs and the docs get collapsed together:

MWE pdf file (relevant section is output of 2nd cell): Interesting analysis.pdf

MWE Pluto.jl notebook

### A Pluto.jl notebook ###
# v0.20.4

using Markdown
using InteractiveUtils

# ╔═╡ b0984797-5f5c-4579-9e7b-6f15827355be
"""
	f(x::Int)

Return 3
"""
f(x::Int) = 3

# ╔═╡ cc54c663-5756-4979-b136-8da6eb7f3a5c
"""
	f(x::Real)

Return 3.0
"""
f(x::Real) = 3.0

# ╔═╡ Cell order:
# ╠═b0984797-5f5c-4579-9e7b-6f15827355be
# ╠═cc54c663-5756-4979-b136-8da6eb7f3a5c