otel: Update 000_opentelemetry_source_options.md

Signed-off-by: Hofi <hofione@gmail.com>

Author: HofiOne

doc/_admin-guide/060_Sources/102_OpenTelemetry/000_opentelemetry_source_options.md

@@ -43,18 +43,20 @@ The `tls()` option accepts the following nested sub-options.
 * ca-file()
 * key-file()
 * cert-file()
+* peer-verify()
 
 #### Example: configure an OpenTelemetry source using auth(tls())
 
 ```config
-destination {
+source {
     opentelemetry(
-      url("your-otel-server:1234")
+      port(1234)
       auth(
         tls(
           ca-file("/path/to/ca.pem")
           key-file("/path/to/key.pem")
           cert-file("/path/to/cert.pem")
+          peer-verify(yes)
         )
       )
     );