Update README.adoc

Updated small typo in target word

Author: r2d2rnd

docs/contributing/README.adoc

@@ -9,7 +9,7 @@
   sudo dnf install -y podman
 `
 
-== Makefile tagets
+== Makefile targets
 
 Quick summary of main targets only, see below and the Makefile itself for more details.
 
@@ -195,4 +195,4 @@ which will allow you to use the script like:
 ----
 CLO_IMAGE=image-registry.openshift-image-registry.svc:5000/openshift/origin-cluster-logging-operator:latest \
 ./hack/gen-olm-artifacts.py bundle/manifests/clusterlogging.clusterserviceversion.yaml  $CLO_IMAGE | oc create -f -
-----
+----