fix(docs): compile the bqRE once at package level

[tampakrap]

Description of your changes

Avoids recompiling the regex on every call to normalizeDetail, slightly improving the speed.

Fixes #

I have:

• Read and followed Crossplane's contribution process.
• Run ./nix.sh flake check to ensure this PR is ready for review.
• Added or updated unit tests.
• Linked a PR or a docs tracking issue to document this change.
• Added backport release-x.y labels to auto-backport this PR.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 9a8eb981-ed14-4afe-ab9e-055cd9576d84

📥 Commits

Reviewing files that changed from the base of the PR and between 6037afd and 5e74bfe.

📒 Files selected for processing (1)

• cmd/crossplane/docs.go

📝 Walkthrough

Walkthrough

A package-level compiled regex variable is added to detect blockquote markers, and the normalizeDetail function is updated to use this pre-compiled regex instead of compiling it locally on each call.

Changes

Blockquote Regex Optimization

Layer / File(s)	Summary
Package-level regex extraction cmd/crossplane/docs.go	Blockquote detection regex is moved from local compilation inside normalizeDetail to a package-level bqRE variable, eliminating repeated regex compilation during function calls.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and descriptively summarizes the main change: moving regex compilation to package level to improve performance.
Description check	✅ Passed	The description is directly related to the changeset, explaining the performance optimization and providing context about the regex compilation change.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Breaking Changes	✅ Passed	No breaking changes. cmd/crossplane/docs.go contains only private functions/variables; regex compilation optimization doesn't affect any public APIs.
Feature Gate Requirement	✅ Passed	PR moves regex compilation to package-level for performance; not a new feature, doesn't affect apis/**, and doesn't change behavior—just optimizes by avoiding repeated compilation.

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