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Correct the README on param versioning and unsupported request bodies (#2961)

Two statements in the README no longer describe what Grape does.

`using: :param` was documented as reading the version "either in the URL
query string or in the request body". The versioner has read the query
string alone since 22b3aefd (v0.10.0, 2013), which stopped building a
Rack::Request there; a version in a JSON or form body is ignored and the
request goes to the first version mounted.

An API with `format :json` was documented as answering a body of another
content type -- or of none, without `default_format` -- with 406. It has
answered 415 since #1765 (2018), whose UPGRADING entry says so; the README
kept the old number in both places.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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