fix(el): correct Greek spelling «Γενέαση» → «Γένεση» in RAG lesson translation

[Copilot]

Copilot review flagged a misspelling in the Greek translation of Lesson 5 — «Γενέαση» is not a valid Greek word; the correct rendering of "Generation" in this context is «Γένεση».

Changes

• lessons/05-rag/translations/README.el.md — corrected «Γενέαση» → «Γένεση» in two places:
  • Line 1: lesson title
  • Line 5: first goals bullet (Ανάκτηση-Ενισχυμένη Γένεση)

The English section heading ## Αφήγηση - Genesis (line 23) is intentionally unchanged — "Genesis" there is a character/section name, not a translation.

Confirmed no remaining «Γενέαση» occurrences across all lessons/**/translations/README.el.md files.

[Copilot]

Pull request overview

This PR fixes a Greek translation misspelling in the Lesson 5 (RAG) README, correcting an invalid Greek word in the lesson title and goals list while keeping the “Genesis” narrative heading intentionally unchanged.

Changes:

• Corrected «Γενέαση» → «Γένεση» in the Lesson 5 Greek translation title.
• Corrected «Γενέαση» → «Γένεση» in the first goals bullet referencing “Retrieval-Augmented Generation (RAG)”.

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