Remove redundant text from EtwManifestEventFormat documentation

Co-authored-by: jkotas <6668460+jkotas@users.noreply.github.com>

Author: Copilot

xml/System.Diagnostics.Tracing/EventSourceSettings.xml

@@ -137,7 +137,7 @@
       </ReturnValue>
       <MemberValue>4</MemberValue>
       <Docs>
-        <summary>The ETW listener should use a manifest-based format when raising events. Setting this option is a directive to the ETW listener should use manifest-based format when raising events. This is the default option when defining a type derived from <see cref="T:System.Diagnostics.Tracing.EventSource" /> using one of the protected <see cref="T:System.Diagnostics.Tracing.EventSource" /> constructors. This format has lower per-event serialization overhead compared to <see cref="F:System.Diagnostics.Tracing.EventSourceSettings.EtwSelfDescribingEventFormat" />.</summary>
+        <summary>The ETW listener should use a manifest-based format when raising events. This is the default option when defining a type derived from <see cref="T:System.Diagnostics.Tracing.EventSource" /> using one of the protected <see cref="T:System.Diagnostics.Tracing.EventSource" /> constructors. This format has lower per-event serialization overhead compared to <see cref="F:System.Diagnostics.Tracing.EventSourceSettings.EtwSelfDescribingEventFormat" />.</summary>
       </Docs>
     </Member>
     <Member MemberName="EtwSelfDescribingEventFormat">