Update copy on managed namespace prefixes

Changes can now be made to existing environments by clearing the cluster
cache.

See https://gitlab.com/gitlab-org/gitlab/issues/27149

app/views/clusters/clusters/_namespace.html.haml

-- managed_namespace_help_text = s_('ClusterIntegration|Choose a prefix to be used for your namespaces. Defaults to your project path.')
+- managed_namespace_help_text = s_('ClusterIntegration|Set a prefix for your namespaces. If not set, defaults to your project path. If modified, existing environments will use their current namespaces until the cluster cache is cleared.')
 - non_managed_namespace_help_text = s_('ClusterIntegration|The namespace associated with your project. This will be used for deploy boards, pod logs, and Web terminals.')
 - managed_namespace_help_link = link_to _('More information'), help_page_path('user/project/clusters/index.md',
   anchor: 'gitlab-managed-clusters'), target: '_blank'

changelogs/unreleased/update-managed-namespace-prefix-copy.yml

+---
+title: Update copy on managed namespace prefixes
+merge_request: 20935
+author:
+type: fixed

locale/gitlab.pot

@@ -3595,9 +3595,6 @@ msgstr ""
 msgid "ClusterIntegration|Certificate Authority bundle (PEM format)"
 msgstr ""
 
-msgid "ClusterIntegration|Choose a prefix to be used for your namespaces. Defaults to your project path."
-msgstr ""
-
 msgid "ClusterIntegration|Choose the %{startLink}security group %{externalLinkIcon} %{endLink} to apply to the EKS-managed Elastic Network Interfaces that are created in your worker node subnets."
 msgstr ""
 
@@ -4132,6 +4129,9 @@ msgstr ""
 msgid "ClusterIntegration|Service token is required."
 msgstr ""
 
+msgid "ClusterIntegration|Set a prefix for your namespaces. If not set, defaults to your project path. If modified, existing environments will use their current namespaces until the cluster cache is cleared."
+msgstr ""
+
 msgid "ClusterIntegration|Show"
 msgstr ""