docs: Document unsupported S3 object keys with double slashes

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Fixes #5063 by documenting that S3 object keys containing
consecutive forward slashes (//) are not supported by rclone.

The issue occurs because rclone normalizes paths like "a//b" to "a/b",
causing "object not found" errors when trying to access the original
object. This documentation addition explicitly warns users about this
limitation and provides workarounds.

Changes:
- Added new subsection "Important note about double slashes (//)"
  under "Restricted filename characters" in S3 documentation
- Explains the normalization behavior and its consequences
- Provides clear examples and workarounds

AI Model/Tool Attribution:
- Implemented using opencode AI assistant
- Issue analysis and documentation update performed by AI tools

Resolves: #5063

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f