feat(contextualhelp): add mod to allow max-width

[TarunAdobe]

Description

Added a --mod property to allow consumers to set a max-width on the contextual help component.

How and where has this been tested?

Please tag yourself on the tests you've marked complete to confirm the tests have been run by someone other than the author.

Validation steps

Regression testing

Validate:

1. The documentation pages for at least two other components are still loading, including:

• The pages render correctly, are accessible, and are responsive.

2. If components have been modified, VRTs have been run on this branch:

• VRTs have been run and looked at.
• Any VRT changes have been accepted (by reviewer and/or PR author), or there are no changes.

Screenshots

To-do list

• I have read the contribution guidelines.
• I have updated relevant storybook stories and templates.
• I have tested these changes in Windows High Contrast mode.
• If my change impacts other components, I have tested to make sure they don't break.
• If my change impacts documentation, I have updated the documentation accordingly.
• ✨ This pull request is ready to merge. ✨

[changeset-bot]

🦋 Changeset detected

Latest commit: b7e1c04

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@spectrum-css/contextualhelp	Patch

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[github-actions]

🚀 Deployed on https://pr-3523--spectrum-css.netlify.app

[github-actions]

File metrics

Summary

Total size: 2.25 MB^*

Package	Size	Minified	Gzipped
contextualhelp	2.20 KB	2.11 KB	0.73 KB

contextualhelp

Filename	Head	Minified	Gzipped	Compared to base
index.css	2.20 KB	2.11 KB	0.73 KB	🔴 ⬆ 0.08 KB
metadata.json	1.30 KB	-	-	🔴 ⬆ 0.06 KB

* Size is the sum of all main files for packages in the library.
* An ASCII character in UTF-8 is 8 bits or 1 byte.

[marissahuysentruyt]

@TarunAdobe Nice work on this! I requested a few minor changes, but overall this is looking really good.

How would you feel about adding some documentation for these new stories? Even something pretty simple, like what you have in the changeset, would be nice.

Example docs: (feel free to expand on this- you can probably do a better job than me!)
"In order to further customize the contextual help popover, implementations can set --mod-spectrum-contextual-help-popover-maximum-width to their desired max width."

It might give users a little head start of figuring out how to customize this component.

[marissahuysentruyt]

@castastrophe @TarunAdobe oh I was just thinking- do we need to run VRTs on this branch before it merges? Since we updated the body content of the stories, I think Chromatic would flag it, right?

Don't want to hold up merging this! Quickly glancing, it's looking good!