Update signal_messenger.markdown (#29588)

* Update signal_messenger.markdown

- changed path and updated explanation for attaching images
- based on https://github.com/haberda/signal-addon/issues/111#issuecomment-1783881882

* remove mention of Docker

---------

Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>
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@ -115,6 +115,9 @@ action:
### Text message with an attachment
This example assumes you have an image stored in the default `www`-folder in Home Assistant Operating System.
```yaml
...
action:
@ -123,7 +126,7 @@ action:
message: "Alarm in the living room!"
data:
attachments:
- "/tmp/surveillance_camera.jpg"
- "/config/www/surveillance_camera.jpg"
```
### Text message with an attachment from a URL