Update tooltip text in security reports

Updated the severity tooltip's text in security reports

ee/app/assets/javascripts/vue_shared/security_reports/components/constants.js

@@ -4,7 +4,7 @@ export * from '~/vue_shared/security_reports/components/constants';
 
 export const SEVERITY_TOOLTIP_TITLE_MAP = {
   unknown: s__(
-    `SecurityReports|The rating "unknown" indicates that the underlying scanner doesn’t contain or provide a severity rating.`,
+    `SecurityReports|Sometimes a scanner can't determine a finding's severity. Those findings may still be a potential source of risk though. Please review these manually.`,
   ),
 };
 

locale/gitlab.pot

@@ -26031,13 +26031,13 @@ msgstr ""
 msgid "SecurityReports|Severity"
 msgstr ""
 
-msgid "SecurityReports|Sorry, your filter produced no results"
+msgid "SecurityReports|Sometimes a scanner can't determine a finding's severity. Those findings may still be a potential source of risk though. Please review these manually."
 msgstr ""
 
-msgid "SecurityReports|Status"
+msgid "SecurityReports|Sorry, your filter produced no results"
 msgstr ""
 
-msgid "SecurityReports|The rating \"unknown\" indicates that the underlying scanner doesn’t contain or provide a severity rating."
+msgid "SecurityReports|Status"
 msgstr ""
 
 msgid "SecurityReports|The security dashboard displays the latest security findings for projects you wish to monitor. Add projects to your group to view their vulnerabilities here."