Remove incorrect "default there is no limit" documentation from trivial_copy_size_limit

[Kampfkarren]

Remove the documentation incorrectly saying there is no default, followed by the default.

changelog: [trivially_copy_pass_by_ref]: Removed incorrect documentation suggesting the default has no limit.

[rustbot]

r? @xFrednet

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[xFrednet]

Nice catch! This looks good to me, thank you!

---

Roses are red,
Violets are blue,
Defaults are set,
with correct doc now.

[xFrednet]

Small thing before we can merge this, the CI fails, could you run cargo bless --test config-metadata and commit the changes? That will copy the update into Clippy's book