Typo in rest.client.adoc: extraneous semicolon in read-timeout value

In the `rest.client.adoc` documentation, the YAML example for HTTP client 
configuration contains a trailing semicolon in the `read-timeout` value.

**Current:**
```yaml
read-timeout: 2s;
```

**Expected:**
```yaml
read-timeout: 2s
```

The semicolon is not valid YAML syntax and could cause confusion 
or errors when users copy the example.

I'd be happy to submit a PR to fix this.