[fey]

Summary

The "Default parameters" lesson now teaches how to read a function's reference: the signature, the parameter descriptions and the return value. Same change as Python in hexlet-basics/exercises-python@b5dbbca.

 modules/35-calling-functions/135-calling-functions-default-params/
~ ru/README.md   # reading the `toFixed()` (MDN) reference, signature notation, check in the browser console
~ es/README.md   # translation of ru
~ en/README.md   # translation of ru; the old en text used a nonexistent global `round()` and has been replaced

The ru and es texts match the Hexlet course copies (https://gitlab.hexlet.io/hexlethq/courses/ru/js_fundamentals_functions_course/-/merge_requests/3).

Evidence

• Before: the lesson named the signature and listed "open docs, look at examples, try in REPL".
  After: calls were checked in Node.js 26. Markdown and code-block linters pass.

Merge Danger

Door: two-way

Blast Radius: lesson

Refs: CONTENT-763

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