fix: Editorial issues

[darrelmiller]

This pull request makes a series of editorial and clarification improvements to the draft-ietf-httpapi-ratelimit-headers.md document. The main focus is on updating references to RFCs, improving terminology consistency, clarifying normative requirements, and correcting minor typos and phrasing for better readability and accuracy.

Key changes include:

Reference and Terminology Updates:

• Updated references to RFC8941 (Structured Fields) and RFC6454 (Web Origin) throughout the document to use consistent shorthand (SF and WEB-ORIGIN) and improved how these are cited in the text. [1] [2] [3] [4]

Normative and Behavioral Clarifications:

• Clarified normative language, such as changing "cannot appear" to "MUST NOT appear" for fields in the trailer section, and improved the explanation of server behavior regarding quota hints and throttling. [1] [2]

Problem Type and Example Corrections:

• Fixed typos and improved the clarity of problem type definitions and example response bodies, including correcting "satisifed" to "satisfied" and updating policy violation field names for consistency. [1] [2]

General Editorial Improvements:

• Improved phrasing and grammar in several sections for better readability (e.g., "an user" to "a user", "unserviced requests" to "requests not being handled"), and clarified intermediary behavior. [1] [2] [3] [4] [5]

These changes help ensure the document is more precise, easier to understand, and consistent in its use of terminology and references.

[Copilot]

Pull Request Overview

This PR addresses various editorial issues in the IETF HTTP API rate limit headers specification document, focusing on improving clarity, consistency, and correctness throughout the document.

• Fixes spelling and grammatical errors throughout the document
• Updates reference formatting to use consistent short names
• Improves clarity of technical language and requirements

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