docs: <code> blocks in headings not rendered correctly

[GeoffreyBooth]

See e.g. https://nodejs.org/api/esm.html#esm_package_json_type_field. The text "type" should be rendered as a code block, yet instead it’s rendered as normal text with wide margins on either side. In earlier versions I tried using backticks but they weren’t supported in Markdown headings.

cc @Trott

[himself65]

commit fdec6bd changed this style

node/doc/api_assets/style.css

Lines 30 to 45 in 2606e1e

	h1, h1 code,
	h2, h2 code,
	h3, h3 code,
	h4, h4 code,
	h5, h5 code,
	h6, h6 code {
	background-color: inherit;
	color: inherit;
	font-family: inherit;
	font-weight: 700;
	line-height: inherit;
	position: relative;
	margin: 1.5rem 0 1rem;
	padding: inherit;
	text-rendering: optimizeLegibility;
	}

[Trott]

Hopeful fix in #31451.