docs: remove merge conflict markers from the cuda.core 1.2.0 release notes

[aryanputta]

Description

cuda_core/docs/source/release/1.2.0-notes.rst on main contains unresolved merge conflict markers at lines 28, 37 and 46:

<<<<<<< HEAD
- The default-stream singletons ...
=======
- :meth:`Linker.which_backend` ...
>>>>>>> origin/main

Both bullets are correct and belong in the notes. Only the three marker lines are removed; no prose is changed.

They entered in 418595b78a (#2490), where the #2485 default-stream bullet and the #2409 nvJitLink bullet from d9da44221 were left unresolved against each other.

Why CI did not catch it

Two reasons, both worth knowing:

• The check-merge-conflict pre-commit hook only reports markers while the repository is mid-merge. A commit that records the markers as ordinary content passes it.
• RST renders the markers as literal text rather than failing the Sphinx build, so Docs / Build docs stayed green.

Without this they would ship verbatim in the published 1.2.0 release notes.

Testing

pre-commit run --files cuda_core/docs/source/release/1.2.0-notes.rst passes, and the file no longer matches <<<<<<<, ======= or >>>>>>>.

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