Fix Documenter binding references

[ChrisRackauckas-Claude]

Summary

Render cross-references to Julia bindings with Documenter's binding-reference syntax in the component docstrings. Documenter 1.18 tightened cross-reference handling, so the prior header-style links now produce 108 strict documentation errors when reused across the API pages.

Ignore this PR until reviewed by @ChrisRackauckas.

Root cause

The affected docstrings used forms such as [Flange](@ref). That syntax asks Documenter to resolve a page-local header or anchor named Flange; these links target Julia bindings and therefore require backticked link text: [`Flange`](@ref). The source contains 65 affected links, which expand to 108 errors because several docstrings appear on more than one rendered API page.

The hosted documentation job was last green with Documenter 1.17 and became red after resolving Documenter 1.18. The stricter resolver exposed malformed existing links; this change corrects the source markup rather than constraining Documenter.

Failing before

On clean main at c873e68232f5a524a0ee727c87ad52835d1c52cf, the full documentation build on Julia 1.11 exited 1 before rendering:

$ julia +1.11 --project=docs --startup-file=no docs/make.jl
...
┌ Error: Cannot resolve @ref for md"[OnePort](@ref)" in docs/src/API/domain_reference.md.
...
ERROR: LoadError: `makedocs` encountered an error [:cross_references] -- terminating build before rendering.

$ rg -c 'Cannot resolve @ref' .validation/docs-before.log
108

The 108 failures were Flange (51), RealOutput (14), OnePort (13), HeatPort (12), RealInput (8), Support (4), and two each for VoltageSensor, Pin, and CurrentSensor.

Passing after

The identical full build with these binding links corrected exited 0 and reached rendering:

$ julia +1.11 --project=docs --startup-file=no docs/make.jl
[ Info: CrossReferences: building cross-references.
[ Info: CheckDocument: running document checks.
[ Info: Populate: populating indices.
[ Info: RenderDocument: rendering document.
[ Info: HTMLWriter: rendering HTML pages.
[ Info: Automatic `version="2.29.7"` for inventory from ../Project.toml

It emitted only the pre-existing HTML-size warnings and the expected local deployment-skip warning.

Verification

$ GROUP=QA julia +release --project=. --startup-file=no -e 'using Pkg; Pkg.test()'
Test Summary: | Pass  Total     Time
QA            |   20     20  11m00.8s
Testing ModelingToolkitStandardLibrary tests passed

The first Core invocation used timeout 3600 and expired in thermal.jl after 533
passing assertions and three pre-existing broken assertions. It reported no test failure;
the complete warm-cache rerun below used a three-hour shell budget:

$ GROUP=Core timeout 10800 julia +release --project=. --startup-file=no -e 'using Pkg; Pkg.test()'
Core test files | 590 pass, 3 pre-existing broken, 593 total
Testing ModelingToolkitStandardLibrary tests passed

$ julia +release --project=../.tmp/runic-env --startup-file=no -m Runic --check --diff <eight changed files>
# exit 0

$ typos <eight changed files>
# exit 0

$ git diff --check
# exit 0

GPU and downstream test groups were not run locally. The change is limited to existing docstring link markup.

Links

• Last green documentation run (Documenter 1.17.0): https://github.com/SciML/ModelingToolkitStandardLibrary.jl/actions/runs/32947148972
• First cross-reference failure (Documenter 1.18.0): https://github.com/SciML/ModelingToolkitStandardLibrary.jl/actions/runs/33439641598
• Failing hosted documentation run: https://github.com/SciML/ModelingToolkitStandardLibrary.jl/actions/runs/33617618326

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