Update distr-tracing-rn.adoc

- Need to remove Un-Required "+" sign from the documentation
- Here is the documentation link: 
https://docs.redhat.com/en/documentation/openshift_container_platform/4.15/html/distributed_tracing/distr-tracing-rn#distr-tracing_2-4_new-features-and-enhancements_distr-tracing-rn

- Documentation looks fine, but due to mistake "+" sing it added in the documentation.
~~~
Self-provisioning by using the Red Hat OpenShift distributed tracing platform (Jaeger) Operator to call the OpenShift Elasticsearch Operator during installation.

+           <<===== Need to remove this sign
~~~

Author: prithvipatil97

observability/distr_tracing/distr-tracing-rn.adoc

@@ -1708,7 +1708,7 @@ This release addresses Common Vulnerabilities and Exposures (CVEs) and bug fixes
 This release adds support for auto-provisioning certificates using the {es-op}.
 
 Self-provisioning by using the {JaegerName} Operator to call the {es-op} during installation.
-+
+
 [IMPORTANT]
 ====
 When upgrading to the {DTProductName} 2.4, the Operator recreates the Elasticsearch instance, which might take five to ten minutes. Distributed tracing will be down and unavailable for that period.