docs: clarify express.json() parses bodies regardless of HTTP method

[bkmaxbaibhav]

Summary

This is a documentation-only clarification — no code or tests were changed.

Body-parsing middleware such as express.json() is not gated by HTTP method: it will attempt to read and parse a request body on any method, including GET, HEAD, and DELETE requests that conventionally carry no body. Developers who apply body-parsing middleware globally via app.use() may not be aware of this, which can affect how they reason about middleware ordering.

Changes

Added an informational note to the express.json() section in both the 4.x and 5.x API reference pages advising developers to:

• Register rate-limiting or request-size-limiting middleware before body-parsing middleware in the chain.
• Apply body-parsing only to routes that expect a request body where possible.

Scope

• Documentation text only, in src/content/api/4x/api/express/index.mdx and src/content/api/5x/api/express/index.mdx
• No behavior changes, no new tests, no dependency changes.

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