docs: Fix highlight line in explicit index documentation (#12887)

## Summary

Fix the highlighted line in [Index
Documentation](https://docs.astral.sh/uv/concepts/projects/dependencies/#index)
(towards the end of the section) - the `explicit = true` line should be
highlighted.

## Test Plan
Docs.
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Ori Shamir 2025-04-15 23:39:56 +03:00 committed by GitHub
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@ -261,7 +261,7 @@ When defining an index, an `explicit` flag can be included to indicate that the
be used for packages that explicitly specify it in `tool.uv.sources`. If `explicit` is not set,
other packages may be resolved from the index, if not found elsewhere.
```toml title="pyproject.toml" hl_lines="3"
```toml title="pyproject.toml" hl_lines="4"
[[tool.uv.index]]
name = "pytorch"
url = "https://download.pytorch.org/whl/cpu"