Fix documentation inconsistencies, typos, and numbering issues

[jeffbrownn]

What changed? Why?

1. Fixed step numbering in packages/illustrations/README.md:

• Duplication of step 2 has been eliminated.
• The sequence of steps has been corrected.

2. Corrected typo errors in cds-web.mdc, theme.ts, CHANGELOG.md:

• deafult -> default
• elemenet -> element
• human-redable -> human-readable
• upadate -> update
• FullscreenMoal -> FullscreenModal

3. Fixed incorrect wording in AGENTS.md:
   run the unit -> run the unit tests
   I clarified the wording to make it grammatically correct and clearly refer to unit tests.

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 1 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1
CODEOWNERS	🟡 See below

🟡 CODEOWNERS

Code Owner	Status	Calculation
ui-systems-eng-team	🟡 0/1	Denominator calculation Additional CODEOWNERS Requirement Show calculation Sum 0 0 From CODEOWNERS 1 Sum 1

[hcopp]

Hey @jeffbrownn thanks for the PR, can you

1. Run yarn nx format:write
2. Run yarn bump-version, select common and do internal for the update type? You can say you were correcting a typo, include this PR #, and ignore Jira ticket
3. Add the following to PR description:

## Illustrations/Icons Checklist

Required if this PR changes files under `packages/illustrations/**` or `packages/icons/**`

- [x] verified visreg changes with Terran (include link to visreg run/approval)
- [x] all illustration/icons names have been reviewed by Dom and/or Terran

[hcopp]

Was able to update in #456 , thanks again for the help!

[jeffbrownn]

Was able to update in #456 , thanks again for the help!

Sorry for not responding