docs: typo in design guidelines awslint rule reference

[weensy]

Describe the issue

docs/DESIGN_GUIDELINES.md contains a typo in an awslint rule reference.

The rule reference currently says construct-inheritence, but it should be spelled construct-inheritance.

Links

• aws-cdk/docs/DESIGN_GUIDELINES.md

  Line 447 in 5961de2

  [_awslint:construct-inheritence_]:

• PR: docs: fix typo in design guidelines #38065

[pahud]

I confirmed the typo on line 447, and your PR #38065 is a clean one-line fix that's mergeable and just waiting on a maintainer review.

[github-actions]

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