docs(rsync): improve README (#13137)

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# rsync
This plugin adds aliases for frequent [rsync](https://rsync.samba.org/) commands.
This plugin adds aliases for frequent [rsync](https://rsync.samba.org/) commands, simplifying file transfer and synchronization tasks.
To use it add `rsync` to the plugins array in you zshrc file.
To use it add `rsync` to the plugins array in you `.zshrc` file.
```zsh
plugins=(... rsync)
```
| Alias | Command |
| ------------------- | ------------------------------------------------ |
| *rsync-copy* | `rsync -avz --progress -h` |
| *rsync-move* | `rsync -avz --progress -h --remove-source-files` |
| *rsync-update* | `rsync -avzu --progress -h` |
| *rsync-synchronize* | `rsync -avzu --delete --progress -h` |
| Alias | Command | Description |
| ------------------- | ------------------------------------------------ | ------------|
| `rsync-copy` | `rsync -avz --progress -h` | Recursively copy files and directories, preserving permissions, timestamps, and symbolic links. Compression is enabled for faster transfers. Progress is displayed in a human-readable format. |
| `rsync-move` | `rsync -avz --progress -h --remove-source-files` | Same as rsync-copy, but removes the source files after a successful transfer (effectively performing a move). |
| `rsync-update` | `rsync -avzu --progress -h` | Like rsync-copy, but only updates files if the source is newer than the destination (or if the destination file is missing). |
| `rsync-synchronize` | `rsync -avzu --delete --progress -h` | Performs bidirectional-style sync: updates files as in rsync-update and deletes files in the destination that no longer exist in the source. Useful for directory synchronization. |
Explanation of Flags:
- -a: Archive mode; preserves symbolic links, permissions, timestamps, etc.
- -v: Verbose; shows details of the transfer process.
- -z: Compress file data during transfer for efficiency.
- -u: Skip files that are newer on the receiver.
- --progress: Show progress during file transfer.
- -h: Output numbers in human-readable format (e.g., 1K, 234M).
- --remove-source-files: Deletes source files after they are copied (used in rsync-move).
- --delete: Deletes files in the destination that are not present in the source (used in rsync-synchronize).