[Bug]: Typo in specification.md — "Metadata keys and are strings" #1950

What happened?

There is a grammatical typo in docs/specification.md at line 475.

Current text:

Metadata keys and are strings and values can be any valid value that can be represented in JSON.

Expected text:

Metadata keys are strings and values can be any valid value that can be represented in JSON.

The extra word "and" after "keys" makes the sentence ungrammatical. This is a minor documentation fix.

Steps to reproduce:

1. Open docs/specification.md
2. Go to line 475 (Metadata section)
3. Observe the typo

A fix is already proposed in PR #1949.

Relevant log output

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