Minor string changes for JIRA setting (#7264)

* Update settings.jsx

* Update en.json

webapp/i18n/en.json

@@ -651,15 +651,15 @@
   "admin.password.symbol": "At least one symbol (e.g. \"~!@#$%^&*()\")",
   "admin.password.uppercase": "At least one uppercase letter",
   "admin.plugins.jira": "JIRA (Beta)",
-  "admin.plugins.jira.channelParamNamePlaceholder": "channelname",
+  "admin.plugins.jira.channelParamNamePlaceholder": "channelurl",
   "admin.plugins.jira.enabledDescription": "When true, you can configure JIRA webhooks to post message in Mattermost. To help combat phishing attacks, all posts are labelled by a BOT tag.",
-  "admin.plugins.jira.enabledLabel": "Enabled:",
+  "admin.plugins.jira.enabledLabel": "Enable JIRA:",
   "admin.plugins.jira.secretDescription": "This secret is used to authenticate to Mattermost.",
   "admin.plugins.jira.secretLabel": "Secret:",
   "admin.plugins.jira.secretParamPlaceholder": "secret",
   "admin.plugins.jira.secretRegenerateDescription": "Regenerates the secret for the webhook URL endpoint. Regenerating the secret invalidates your existing JIRA integrations.",
   "admin.plugins.jira.setupDescription": "Use this webhook URL to set up the JIRA integration. See {webhookDocsLink} to learn more.",
-  "admin.plugins.jira.teamParamPlaceholder": "teamname",
+  "admin.plugins.jira.teamParamPlaceholder": "teamurl",
   "admin.plugins.jira.userDescription": "Select the username that this integration is attached to.",
   "admin.plugins.jira.userLabel": "User:",
   "admin.plugins.jira.webhookDocsLink": "documentation",