Small cleanup around the term "proxy" (#3824)

src/IceRpc.Slice/PipeReaderExtensions.cs

@@ -42,7 +42,7 @@ public static IAsyncEnumerable<T> ToAsyncEnumerable<T>(
 
         IEnumerable<T> DecodeBuffer(ReadOnlySequence<byte> buffer)
         {
-            // Since the elements are fixed-size, they can't contain proxies hence serviceProxyFactory can remain null.
+            // Since the elements are fixed-size, they can't contain service addresses hence baseProxy can remain null.
             var decoder = new SliceDecoder(
                 buffer,
                 encoding,

src/IceRpc.Slice/ServiceAddressSliceDecoderExtensions.cs

@@ -185,7 +185,7 @@ private static ServerAddress DecodeServerAddress(this ref SliceDecoder decoder,
     /// <returns>The decoded service address.</returns>
     private static ServiceAddress DecodeServiceAddressCore(this ref SliceDecoder decoder, string path)
     {
-        // With Slice1, a proxy is encoded as a kind of discriminated union with:
+        // With Slice1, a service address is encoded as a kind of discriminated union with:
         // - Identity
         // - If Identity is not the null identity:
         //     - the fragment, invocation mode, secure, protocol major and minor, and the encoding major and minor

src/IceRpc/Pipeline.cs

@@ -8,7 +8,7 @@ namespace IceRpc;
 /// request over a connection.</summary>
 /// <example>
 /// The following example demonstrates how an application would typically create the pipeline and use it as the invoker
-/// for a proxy.
+/// for a Slice proxy or Protobuf client.
 /// <code source="../../docfx/examples/IceRpc.Examples/PipelineExamples.cs" region="CreatingAndUsingThePipeline" lang="csharp" />
 /// You can easily create your own interceptor and add it to the pipeline. The next example shows how you can create an
 /// interceptor using an <see cref="InlineInvoker"/> and add it to the pipeline with