Clarify MemberInfo.IsCollectible documentation

MemberInfo can reference multiple different assemblies (e.g. via generic instantiation or via reflected type). IsCollectible property must take all references into account.

Related to dotnet/runtime#119869

Author: jkotas

xml/System.Reflection/MemberInfo.xml

@@ -721,9 +721,9 @@
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>Gets a value that indicates whether this <see cref="T:System.Reflection.MemberInfo" /> object is part of an assembly held in a collectible <see cref="T:System.Runtime.Loader.AssemblyLoadContext" />.</summary>
+        <summary>Gets a value that indicates whether this <see cref="T:System.Reflection.MemberInfo" /> object references one or more assemblies held in a collectible <see cref="T:System.Runtime.Loader.AssemblyLoadContext" />.</summary>
         <value>
-          <see langword="true" /> if the <see cref="T:System.Reflection.MemberInfo" /> is part of an assembly held in a collectible assembly load context; otherwise, <see langword="false" />.</value>
+          <see langword="true" /> if the <see cref="T:System.Reflection.MemberInfo" /> references one or more assemblies held in a collectible assembly load context; otherwise, <see langword="false" />.</value>
         <remarks>
           <format type="text/markdown"><![CDATA[
 

xml/System.Reflection/TypeDelegator.xml

@@ -2285,9 +2285,9 @@ t.InvokeMember ("MyArray", BindingFlags.SetField, null, this, new
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>Gets the <see cref="P:System.Reflection.MemberInfo.IsCollectible" /> value for this object's <see cref="F:System.Reflection.TypeDelegator.typeImpl" />, which indicates whether this object, which is a <see cref="T:System.Reflection.MemberInfo" /> implementation, is part of an assembly held in a collectible <see cref="T:System.Runtime.Loader.AssemblyLoadContext" />.</summary>
+        <summary>Gets the <see cref="P:System.Reflection.MemberInfo.IsCollectible" /> value for this object's <see cref="F:System.Reflection.TypeDelegator.typeImpl" />, which indicates whether this object, which is a <see cref="T:System.Reflection.MemberInfo" /> implementation, references one or more assemblies held in a collectible <see cref="T:System.Runtime.Loader.AssemblyLoadContext" />.</summary>
         <value>
-          <see langword="true" /> if this object, which is a <see cref="T:System.Reflection.MemberInfo" /> implementation, is part of an assembly held in a collectible assembly load context; otherwise, <see langword="false" />.</value>
+          <see langword="true" /> if this object, which is a <see cref="T:System.Reflection.MemberInfo" /> implementation, references one or more assemblies held in a collectible assembly load context; otherwise, <see langword="false" />.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>