chore: Update CONTRIBUTING with process and minor changes

[Lms24]

• Adds attribute PR approval process specified in SDK dev docs
• Minor adjustments from recent changes around docs and code generation
• Minor heading level adjustments

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

Attributes

• Add gen_ai.conversation.id by obostjancic in #250
• Add sentry.profiler_id attribute by Lms24 in #242
• Add attribute gen_ai.response.time_to_first_token by constantinius in #227
• Add sentry.status_code attribute by mjq in #223
• Backfill db.system attribute by mjq in #224
• Add sentry.category attribute by mjq in #218
• Add sentry.normalized_db_query.hash by Ahmed-Labs in #200

Other

• (ai) Add input tokens cache write by shellmayr in #217
• (gen_ai) Add new Gen AI attributes by obostjancic in #221
• Add Culture context model attributes by logaretm in #243
• Better docs website by Lms24 in #238
• Add page listing all attributes by Lms24 in #207

Bug Fixes 🐛

Attributes

• Migrating several numeric fields to pii=maybe by constantinius in #228
• Improve gen_ai.operation.name description by obostjancic in #225

Other

• (db) Clarify db.query.text and db.query.summary attributes by Lms24 in #208

Documentation 📚

• Fix sentry logo in light mode by Lms24 in #249
• Link to individual attributes by Lms24 in #248
• Add links to llms.txt files by Lms24 in #247
• Add toggleable dark and light mode by Lms24 in #246
• Use proper svelte 5 syntax in search modal by Lms24 in #244
• Add llms.txt for full list of attributes by Lms24 in #245

Internal Changes 🔧

Attributes

• Update sentry.span.source with known values by Lms24 in #214
• Add legacy attribute definitions for transaction spans by Ahmed-Labs in #212
• Normalize deprecated db attribute names by Ahmed-Labs in #199

Deps Dev

• Bump tar from 7.5.4 to 7.5.7 by dependabot in #239
• Bump tar from 7.5.3 to 7.5.4 by dependabot in #226
• Bump tar from 7.4.3 to 7.5.3 by dependabot in #220

Repo

• Remove stale generated MD pages by Lms24 in #252
• Add Claude Code settings with basic permissions by philipphofmann in #222
• Unstale yarn lock by Lms24 in #215

Other

• (ai) Remove gen_ai_usage_total_cost attribute by vgrozdanic in #206
• (lint) Don't lint Claude's config files by mjq in #219
• (release) Switch from action-prepare-release to Craft by BYK in #216

• Update CONTRIBUTING with process and minor changes by Lms24 in #255

• Add statuses permission to Changelog Preview by lcian in #232

Other

• test: Fix python venv installation issue by Lms24 in #254
• Add more CODEOWNERS by cleptric in #240
• Add @getsentry/ingest to CODEOWNERS by cleptric in #236
• Update CODEOWNERS to change global ownership by cleptric in #230

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[Lms24]

Gonna put this to draft for now since things are moving fast and we'll prioritize getting conventions up to speed before we make the process stricter.