Document missing DiagnosticMethodInfo info (#10393)

Contributes to dotnet/runtime#105980

Author: MichalStrehovsky

xml/System.Diagnostics/DiagnosticMethodInfo.xml

@@ -56,9 +56,9 @@
         <Parameter Name="delegate" Type="System.Delegate" />
       </Parameters>
       <Docs>
-        <param name="delegate">To be added.</param>
+        <param name="delegate">The delegate to examine.</param>
         <summary>Creates a <see cref="T:System.Diagnostics.DiagnosticMethodInfo" /> that represents the target of the delegate.</summary>
-        <returns>To be added.</returns>
+        <returns>An object that represents the method.</returns>
         <remarks>
           <para>This returns the definition of the target method, with stripped instantiation information.</para>
           <para>The return value might be <see langword="null" /> if the `StackTraceSupport` feature switch is set to <see langword="false" />.</para>
@@ -90,9 +90,9 @@
         <Parameter Name="frame" Type="System.Diagnostics.StackFrame" />
       </Parameters>
       <Docs>
-        <param name="frame">To be added.</param>
+        <param name="frame">The stack frame to examine.</param>
         <summary>Creates a <see cref="T:System.Diagnostics.DiagnosticMethodInfo" /> that represents the method this stack frame is associtated with.</summary>
-        <returns>To be added.</returns>
+        <returns>An object that represents the stack frame.</returns>
         <remarks>
           <para>This returns the definition of the target method, with stripped instantiation information.</para>
           <para>The return value might be <see langword="null" /> if the `StackTraceSupport` feature switch is set to <see langword="false" />.</para>