Introduce the term grid-lanes to the masonry feature

[captainbrosset]

Fixes #2045.

The CSSWG has resolved to make masonry its own display type, and decided to call it grid-lanes.

It's important that our feature uses this term, but at the same time retain the masonry name too. The spec still uses it, and that's how most developers who know about this type of layout likely refer to it.

Let's iterate on a better description.

[ddbeck]

Ugh, I am really disappointed that CSSWG decided to invent a new name for this. We're now likely to see a half decade of "grid lanes (formerly known as masonry)" and "masonry (also known as grid lanes)" and the like. 😞

In addition to my suggestions below, I think we should preemptively reserve the IDs:

• display-grid-lanes
• grid-lanes

They would be kind: move feature entries that point to the existing masonry feature.

[ddbeck]

I think we should:

• Mention CSS
• Retain the illustrative metaphor.
• Explicitly mention the display: grid-lanes and display: inline-grid-lanes entrypoints (unless we think it's likely that implementers will do the latter separately). This lets us out of saying "also known as" which I'm not convinced is a true statement (at least not yet).

Maybe something like this:

Suggested change

	description: Masonry is a two-dimensional layout system where items are tightly packed within parallel lanes. Items are placed one by one in the lane which has the most space available. Also known as grid-lanes.
	description: Masonry, created by a `display: grid-lanes` or `display: inline-grid-lanes` CSS declaration, is a two-dimensional layout system where items are tightly packed in parallel, like brickwork. Items are placed one by one in the lane that has the most available space.