Confusing display of 1.0.0 stability

[jsha]

At https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html (same issue on stable), the "1.0.0" stability on the right-hand side is displayed inconsistently. It seems to show up only when there is also const stability to display. Example:

new shows stability of 1.0.0 (const: 1.39.0). with_capacity shows no stability information. But both have #[stable(feature = "rust1", since = "1.0.0")]:

https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#424
https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#469

Note: Hiding 1.0.0 stability for the stdlib may actually be the right thing to do, to reduce noise. But if that's the intent, we should do it consistently - for instance also hiding 1.0.0 in the <h1> at the top of the page.

[KamilaBorowska]

In general, Rust documentation doesn't show stability information when it matches stability of a type itself.

[jsha]

Ah, that makes sense - though it's hard to discover that property as a user. Maybe the main fix here is to change 1.0.0 (const: 1.39.0) to just const: 1.39.0.