Merge pull request #92466 from openshift-cherrypick-robot/cherry-pick-91832-to-enterprise-4.18

[enterprise-4.18] MTC 1.8.6 does not support multiple migplans per namespace

Author: ShaunaDiaz

modules/migration-creating-migration-plan-cam.adoc

@@ -29,6 +29,11 @@ The migration plan name must not exceed 253 lower-case alphanumeric characters (
 . Click *Next*.
 . Select the projects for migration.
 . Optional: Click the edit icon beside a project to change the target namespace.
++
+[WARNING]
+====
+{mtc-full} 1.8.6 and later versions do not support multiple migration plans for a single namespace.
+====
 . Click *Next*.
 . Select a *Migration type* for each PV: