Manually add standard vim modeline to bottom of help docs

[gbroques]

For syntax highlighting and other features that are based on filetype.

Closes #12.

[gemini-code-assist]

Summary of Changes

Hello @gbroques, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a quality-of-life improvement for users viewing help documentation files. By embedding standard Vim modelines at the end of these files, the change enables Vim to automatically detect the correct filetype and apply optimal display settings, such as text wrapping and tab handling. This enhancement aims to provide a more consistent and user-friendly experience when interacting with the documentation, directly addressing and resolving a previously identified issue.

Highlights

• Vim Modelines: Standard Vim modelines have been appended to the end of several help documentation files.
• Improved Editor Experience: This change ensures that Vim automatically recognizes the filetype as 'help' and applies appropriate settings like text width, tab stop, and no expandtab, enhancing readability and editing.
• Bug Fix/Enhancement: Addresses and closes issue #11, which likely pertained to incorrect rendering or editing behavior of these help files in Vim.

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[gemini-code-assist]

Code Review

This pull request adds a standard Vim modeline to the end of the Lua reference help documents and their translations. The change is consistent across all files and uses appropriate settings for Vim help files (ft=help, tw=78, ts=8, etc.), which will improve the editing experience for users of Vim by ensuring correct syntax highlighting and formatting. The implementation is correct and follows common practices for modelines. I have no further suggestions.