fix(filecoin-site): resolve markdownlint errors in ProPGF blog posts

[beck-8]

Problem

Two blog posts on main (added via TinaCMS content updates) carry 4 markdownlint errors. Since the husky pre-commit hook runs npm run lint:md over the whole repo, every local commit is currently blocked for all contributors unless they bypass hooks with --no-verify (as noted in #2343).

Announcing-Filecoin-ProPGF-Batch-3-Selection-Committee.md:24:42  MD026  Trailing punctuation in heading
Announcing-Filecoin-ProPGF-Batch-3-Selection-Committee.md:58:36  MD037  Spaces inside emphasis markers
ProPGF-Batch-3-Call-for-Builders.md:19                           MD001  Heading levels should only increment by one
ProPGF-Batch-3-Call-for-Builders.md:92:1                         MD030  Spaces after list markers

Fix (formatting only, no wording changes)

Announcing-Filecoin-ProPGF-Batch-3-Selection-Committee.md

• MD026: drop the trailing colon from the ### Selection Committee Members (Batch 3): heading
• MD037: **Core Infrastructure Maintenance **Committee members... → **Core Infrastructure Maintenance**: Committee members..., matching the sibling **RFP Responses**: bullet

ProPGF-Batch-3-Call-for-Builders.md

• MD001: promote A Living Document and Understanding “Pods” from h3 to h2 — they are top-level sections, siblings of ## Four Focus Areas. The front matter title: acts as the page h1, so body sections start at h2 (same structure as every other blog post, e.g. Announcing-Filecoin-ProPGF-Batch-3-General-Track.md)
• MD030: * Funding: (two spaces) → * Funding: (one space)

Verification

• npm run lint:md: 0 errors across 1478 files (was 4)
• Pre-commit hook passes again without --no-verify

Note: these files are TinaCMS-managed, so a future CMS save could reintroduce formatting issues — but this unblocks local commits for everyone now.

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
ffdweb-site	Skipped		Jun 12, 2026 7:00am
filecoin-foundation-site	Skipped		Jun 12, 2026 7:00am
filecoin-foundation-uxit	Skipped		Jun 12, 2026 7:00am

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Cleans up Markdown formatting in two Filecoin ProPGF Batch 3 blog posts to improve rendering consistency (headings, lists, and emphasis).

Changes:

• Fixes improperly indented headings so they render as headings (not code blocks).
• Normalizes heading text/punctuation and list spacing.
• Corrects bold/emphasis formatting in a committee responsibilities bullet.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
apps/filecoin-site/content/blog/posts/en/ProPGF-Batch-3-Call-for-Builders.md	Fixes heading indentation/levels and normalizes list item spacing for proper Markdown rendering.
apps/filecoin-site/content/blog/posts/en/Announcing-Filecoin-ProPGF-Batch-3-Selection-Committee.md	Normalizes a heading and fixes broken bold formatting in a list item.

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