Update Xamarin.Android.NUnitLite.dll documentation.

Context: https://bugzilla.xamarin.com/show_bug.cgi?id=14106

The fix to add Assert.Throws<T>() results in lots of API changes due
to adding the CLR_4_0 #define to NUnit, e.g.
NUnit.Framework.Api.IPropertyBag.Keys changes from ICollection to
ICollection<string> (and _lots_ of similar changes).

Author: jonpryor

docs/Xamarin.Android.NUnitLite/en/NUnit.Framework.Api/AttributeDictionary.xml

@@ -1,12 +1,16 @@
 <Type Name="AttributeDictionary" FullName="NUnit.Framework.Api.AttributeDictionary">
-  <TypeSignature Language="C#" Value="public class AttributeDictionary : System.Collections.Specialized.StringDictionary" />
-  <TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit AttributeDictionary extends System.Collections.Specialized.StringDictionary" />
+  <TypeSignature Language="C#" Value="public class AttributeDictionary : System.Collections.Generic.Dictionary&lt;string,string&gt;" />
+  <TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit AttributeDictionary extends System.Collections.Generic.Dictionary`2&lt;string, string&gt;" />
   <AssemblyInfo>
     <AssemblyName>Xamarin.Android.NUnitLite</AssemblyName>
     <AssemblyVersion>0.9.0.0</AssemblyVersion>
   </AssemblyInfo>
   <Base>
-    <BaseTypeName>System.Collections.Specialized.StringDictionary</BaseTypeName>
+    <BaseTypeName>System.Collections.Generic.Dictionary&lt;System.String,System.String&gt;</BaseTypeName>
+    <BaseTypeArguments>
+      <BaseTypeArgument TypeParamName="!0">System.String</BaseTypeArgument>
+      <BaseTypeArgument TypeParamName="!1">System.String</BaseTypeArgument>
+    </BaseTypeArguments>
   </Base>
   <Interfaces />
   <Docs>
@@ -29,47 +33,5 @@
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
-    <Member MemberName="Add">
-      <MemberSignature Language="C#" Value="public override void Add (string key, string value);" />
-      <MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance void Add(string key, string value) cil managed" />
-      <MemberType>Method</MemberType>
-      <AssemblyInfo>
-        <AssemblyVersion>0.9.0.0</AssemblyVersion>
-      </AssemblyInfo>
-      <ReturnValue>
-        <ReturnType>System.Void</ReturnType>
-      </ReturnValue>
-      <Parameters>
-        <Parameter Name="key" Type="System.String" />
-        <Parameter Name="value" Type="System.String" />
-      </Parameters>
-      <Docs>
-        <param name="key">The attribute key</param>
-        <param name="value">The attribute value</param>
-        <summary>
-            Adds a key and value to the dictionary. Overridden to
-            save the order in which keys are added.
-            </summary>
-        <remarks>To be added.</remarks>
-      </Docs>
-    </Member>
-    <Member MemberName="Keys">
-      <MemberSignature Language="C#" Value="public override System.Collections.ICollection Keys { get; }" />
-      <MemberSignature Language="ILAsm" Value=".property instance class System.Collections.ICollection Keys" />
-      <MemberType>Property</MemberType>
-      <AssemblyInfo>
-        <AssemblyVersion>0.9.0.0</AssemblyVersion>
-      </AssemblyInfo>
-      <ReturnValue>
-        <ReturnType>System.Collections.ICollection</ReturnType>
-      </ReturnValue>
-      <Docs>
-        <summary>
-            Gets the keys in the same order they were added.
-            </summary>
-        <value>To be added.</value>
-        <remarks>To be added.</remarks>
-      </Docs>
-    </Member>
   </Members>
 </Type>

docs/Xamarin.Android.NUnitLite/en/NUnit.Framework.Api/IPropertyBag.xml

@@ -312,14 +312,14 @@
       </Docs>
     </Member>
     <Member MemberName="Keys">
-      <MemberSignature Language="C#" Value="public System.Collections.ICollection Keys { get; }" />
-      <MemberSignature Language="ILAsm" Value=".property instance class System.Collections.ICollection Keys" />
+      <MemberSignature Language="C#" Value="public System.Collections.Generic.ICollection&lt;string&gt; Keys { get; }" />
+      <MemberSignature Language="ILAsm" Value=".property instance class System.Collections.Generic.ICollection`1&lt;string&gt; Keys" />
       <MemberType>Property</MemberType>
       <AssemblyInfo>
         <AssemblyVersion>0.9.0.0</AssemblyVersion>
       </AssemblyInfo>
       <ReturnValue>
-        <ReturnType>System.Collections.ICollection</ReturnType>
+        <ReturnType>System.Collections.Generic.ICollection&lt;System.String&gt;</ReturnType>
       </ReturnValue>
       <Docs>
         <summary>