docs(cards): fix broken TOC anchor and grammar typo

[kiwigitops]

Two small fixes in docs/cards.md:

1. The Table of Contents entry [Creating Custom Installable Cards](#creating-custom-cards) doesn't jump anywhere — the actual heading at line 254 is ### Creating Custom Installable Cards, so the GitHub-flavored anchor is #creating-custom-installable-cards.
2. current.card[...] is described as "to helps add components to a card" — should be "to help add".

-* [Creating Custom Installable Cards](#creating-custom-cards)
+* [Creating Custom Installable Cards](#creating-custom-installable-cards)

-...`current.card['myid']` to helps add components to a card.
+...`current.card['myid']` to help add components to a card.

Docs-only — no code or tests touched.

[greptile-apps]

Greptile Summary

This PR makes two small documentation corrections to docs/cards.md with no code changes.

• Fixes a broken Table of Contents anchor (#creating-custom-cards → #creating-custom-installable-cards) so the link correctly targets the ### Creating Custom Installable Cards heading.
• Fixes a grammar error ("to helps add" → "to help add") in the introductory paragraph describing current.card['myid'].

Confidence Score: 5/5

Documentation-only change; no logic, tests, or configuration touched.

Both edits are correct: the TOC anchor now matches the actual heading text, and the grammar fix is unambiguous. Nothing else in the file was modified.

No files require special attention.

Important Files Changed

Filename	Overview
docs/cards.md	Two correct documentation fixes: broken TOC anchor updated to match the actual heading, and "to helps add" corrected to "to help add".

_{Reviews (1): Last reviewed commit: "docs(cards): fix broken TOC anchor and "..." | Re-trigger Greptile}