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
