badwords: combine the whitelisting into a single regex

[bagder]

Takes it down from 3.6 seconds to 1.1 on my machine.

[Copilot]

Pull request overview

This PR optimizes the scripts/badwords checker by consolidating whitelist removals into a single regex to reduce runtime, and includes a couple of small documentation wording tweaks.

Changes:

• Combine multiple whitelist patterns into one precompiled regex in scripts/badwords.
• Extend whitelist removal to include backticked text removal via the whitelist mechanism.
• Minor wording/grammar adjustments in documentation files.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 3 comments.

File	Description
scripts/badwords	Combines whitelist stripping into a single regex to improve performance.
docs/tests/FILEFORMAT.md	Minor grammar adjustment in test file format documentation.
docs/cmdline-opts/connect-to.md	Wording tweak (“host name” → “hostname”).

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[bagder]

augment review

[augmentcode]

🤖 Augment PR Summary

Summary: Speeds up scripts/badwords by combining all whitelisting patterns into one precompiled regex and stripping them in a single pass.
Changes: Also whitelists Markdown bold/code spans during scanning and makes small wording tweaks in two documentation files.

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[augmentcode]

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