Fix ruff

[joamatab]

fix some ruff issues

Summary by Sourcery

Fix various linting issues.

Bug Fixes:

• Fixed a typo in a comment.
• Removed an unused import.
• Fixed a syntax error in a code example.
• Fixed a bug in the bend_euler function where the docstring was incorrectly formatted.
• Fixed a bug where the propagation loss was not being printed.
• Fixed a bug where the effective index was not being printed.
• Fixed a bug in the mmi2x2 function where the loss_dB_bar parameter was incorrectly named loss_dB_thru.
• Fixed a bug in the write_sdevice_quasistationary_ramp_voltage_dd function where the parameters were incorrectly documented.
• Fixed a bug where the coupling length docstring was incorrectly formatted.
• Fixed a bug where the layer to port delimiter was incorrectly documented as layer-port delimiter.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request fixes some ruff issues in the notebooks and makes some minor code improvements.

Flow diagram of code cleanup changes

flowchart LR
    subgraph Changes[Code Cleanup Changes]
        A[Remove unused imports]
        B[Fix docstring formatting]
        C[Convert code cells to markdown]
        D[Add print statements]
        E[Fix comment formatting]
    end

    style Changes fill:#f5f5f5,stroke:#333,stroke-width:2px
    style A fill:#e1f5fe
    style B fill:#e1f5fe
    style C fill:#e1f5fe
    style D fill:#e1f5fe
    style E fill:#e1f5fe

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File-Level Changes

Change	Details	Files
Removed unused import	Removed the unused pyvista import	notebooks/elmer_01_electrostatic.ipynb
Changed cell type and added code	Changed a code cell to a markdown cell and included the code in a markdown code block Added code to display results and visualize the field	notebooks/elmer_01_electrostatic.ipynb
Added missing imports and function call	Added meep import Added get_simulation import from gplugins.gmeep Added code to define an objective function and plot the geometry after each iteration	notebooks/meep_01_sparameters.ipynb
Added code for bitmask definition	Added code to define spatial arrays and bitmasks for boundary conditions	notebooks/meep_01_sparameters.ipynb
Added print statements	Added print statements for strip.n_eff and propagation_loss	notebooks/tidy3d_01_tidy3d_modes.ipynb notebooks/tidy3d_01_tidy3d_bend.ipynb
Updated kernel specification	Changed kernel display name from "Python 3" to "base" Added language information	notebooks/tidy3d_01_tidy3d_modes.ipynb
Updated sdevice function parameters	Changed filepath, file_settings, output_settings, physics_settings, math_settings, and initialization_commands parameters to filename, save_directory, execution_directory, output_settings, physics_settings, and math_settings	gplugins/sentaurus/sdevice.py
Added HyperOptSearch import	Added import for HyperOptSearch from ray.tune.search.hyperopt	notebooks/ray_optimiser.ipynb
Added import and docstring update	Added matplotlib.pyplot import Updated bend_euler docstring Removed unnecessary newline characters	notebooks/workflow_2_ring.ipynb notebooks/sax_01_sax.ipynb
Updated parameter names and docstrings	Simplified docstrings Renamed loss_dB_bar parameter to loss_dB_thru Removed unnecessary newline characters	gplugins/vlsir/export_netlist.py gplugins/sax/models.py notebooks/mpb_001_mpb_waveguide.ipynb notebooks/palace_01_electrostatic.ipynb

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