docs(github): document fetch retry backoff constants

[gitsofyash]

Description

Fixes #393

Added inline comments documenting the retry constants and exponential backoff formula used by fetchWithRetry.

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs)

Visual Preview

N/A — docs-only code comment change.

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