fix underscore

Author: AbhiPrasad

docs/concepts/otlp/index.mdx

@@ -39,7 +39,7 @@ You can configure your OTEL collector instance to send traces to Sentry directly
 ```yaml {filename: otel-collector.yaml}
 exporters:
   otlphttp:
-    traces_endpoint: __OTLP_TRACES_URL___
+    traces_endpoint: ___OTLP_TRACES_URL___
     headers:
       x-sentry-auth: "sentry sentry_key=___PUBLIC_KEY___"
     compression: gzip
@@ -97,7 +97,7 @@ You can configure your OTEL collector instance to send logs to Sentry directly.
 ```yaml {filename: otel-collector.yaml}
 exporters:
   otlphttp:
-    logs_endpoint: __OTLP_LOGS_URL___
+    logs_endpoint: ___OTLP_LOGS_URL___
     headers:
       x-sentry-auth: "sentry sentry_key=___PUBLIC_KEY___"
     compression: gzip