Docs: Fix typo in development guide

[ankurv37]

Fixes #
N/A

Proposed Changes

🧹 Fixed typos in internal documentation

• Fixed spelling errors in docs/broker/filtering.md
• Fixed spelling errors in docs/decisions/eventing-and-messaging.md
• Fixed spelling errors in docs/delivery/README.md

Pre-review Checklist

(Documentation fix only - no code changes)

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

NONE

Docs

N/A

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: ankurv37 / name: Ankur Verma (7f2fcaa)

[knative-prow]

Welcome @ankurv37! It looks like this is your first PR to knative/eventing 🎉

[knative-prow]

Hi @ankurv37. Thanks for your PR.

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[knative-prow]

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