Fix the text on Kubenetes Agent modal

This fixes the text on Kubernetes Agent modal.

Changelog: fixed

app/assets/javascripts/clusters_list/constants.js

@@ -106,7 +106,7 @@ export const I18N_AGENT_MODAL = {
   empty_state: {
     modalTitle: s__('ClusterAgents|Connect your cluster through the Agent'),
     modalBody: s__(
-      "ClusterAgents|To install a new agent, first add the agent's configuration file to this repository. %{linkStart}What's the agent's configuration file?%{linkEnd}",
+      "ClusterAgents|To install a new agent, first add the agent's configuration file to this repository. %{linkStart}Learn more about installing GitLab Agent.%{linkEnd}",
     ),
     enableKasText: s__(
       "ClusterAgents|Your instance doesn't have the %{linkStart}GitLab Agent Server (KAS)%{linkEnd} set up. Ask a GitLab Administrator to install it.",

locale/gitlab.pot

@@ -7730,7 +7730,7 @@ msgstr ""
 msgid "ClusterAgents|To delete the agent, type %{name} to confirm:"
 msgstr ""
 
-msgid "ClusterAgents|To install a new agent, first add the agent's configuration file to this repository. %{linkStart}What's the agent's configuration file?%{linkEnd}"
+msgid "ClusterAgents|To install a new agent, first add the agent's configuration file to this repository. %{linkStart}Learn more about installing GitLab Agent.%{linkEnd}"
 msgstr ""
 
 msgid "ClusterAgents|Token created by %{userName}"