docs(openwrt): refine installation and configuration instructions

Remove redundant `chmod +x` command from binary installation.
The `mv` command typically preserves execute permissions for binaries.

Add explicit instruction to create the `/etc/init.d/telbot` file.
This guides users more clearly before pasting the script content.

Author: 0xtbug

docs/openwrt.md

@@ -17,7 +17,6 @@ ssh root@your-router-ip
 2. Move it to `/usr/bin/` and make it executable:
    ```bash
    mv /tmp/telbot /usr/bin/telbot
-   chmod +x /usr/bin/telbot
    ```
 
 ## 2. Persistent Configuration
@@ -48,6 +47,11 @@ cp /root/.env /.config/telbot/.env
 
 To ensure Telbot starts automatically and restarts on crashes, create a `procd` init script at `/etc/init.d/telbot`:
 
+Create file /etc/init.d/telbot
+```bash
+nano /etc/init.d/telbot
+```
+
 ```bash
 #!/bin/sh /etc/rc.common