update story to contain dollar sign

[anakaren-rojas]

Summary:

Add on to #1865 - updates story to include $

Issue: XXX-XXXX

Test plan:

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/nice-tips-ring.md, packages/perseus/src/widgets/interactive-graphs/interactive-graph-regression.stories.tsx

---

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[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (7de9528) and published it to npm. You
can install it using the tag PR1870.

Example:

yarn add @khanacademy/perseus@PR1870

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR1870

[github-actions]

Size Change: 0 B

Total Size: 1.29 MB

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.9 kB
packages/keypad-context/dist/es/index.js	760 B
packages/kmath/dist/es/index.js	4.27 kB
packages/math-input/dist/es/index.js	77.8 kB
packages/math-input/dist/es/strings.js	1.79 kB
packages/perseus-core/dist/es/index.js	1.48 kB
packages/perseus-editor/dist/es/index.js	699 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus/dist/es/index.js	420 kB
packages/perseus/dist/es/strings.js	3.55 kB
packages/pure-markdown/dist/es/index.js	3.66 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[benchristel]

LGTM!

[catandthemachines]

Looks good to me 😉

[catandthemachines]

Looks good to me 😉

[anakaren-rojas]

Might not end up being needed!