Clarify how Filtering out internal users works (#5486)

Got feedback that it was very confusing whether the filter is applied as is, or in negation. (as is makes sense for properties, but makes very little sense for cohorts, since internal users cohort size <<< external users cohort size)

frontend/src/scenes/project/Settings/index.tsx

@@ -172,6 +172,10 @@ export function ProjectSettings(): JSX.Element {
                     company's team members, or <i>Host ∌ localhost</i> to exclude all events from local development
                     environments.
                 </p>
+                <p>
+                    <b>The filters you apply here are added as extra filters when the toggle is switched on.</b> So, if
+                    you apply a Cohort filter, it means toggling filtering on will match only this specific cohort.
+                </p>
                 <TestAccountFiltersConfig />
                 <Divider />
                 <h2 className="subtitle" id="urls">