update nuget package descriptions

src/csharp/Grpc.Core.Testing/Grpc.Core.Testing.csproj

@@ -5,7 +5,7 @@
 
   <PropertyGroup>
     <Authors>Google Inc.</Authors>
-    <Description>gRPC C#: Utility code for testing Grpc.Core</Description>
+    <Description>Miscellaneous code for testing Grpc.Core</Description>
     <Copyright>Copyright 2017, Google Inc.</Copyright>
     <PackageLicenseUrl>https://github.com/grpc/grpc/blob/master/LICENSE</PackageLicenseUrl>
     <PackageProjectUrl>https://github.com/grpc/grpc</PackageProjectUrl>

src/csharp/Grpc.Core/Grpc.Core.csproj

@@ -6,7 +6,7 @@
   <PropertyGroup>
     <Authors>Google Inc.</Authors>
     <Copyright>Copyright 2015, Google Inc.</Copyright>
-    <Description>C# implementation of gRPC - an RPC library and framework.</Description>
+    <Description>C# implementation of gRPC based on native gRPC C-core library.</Description>
     <PackageLicenseUrl>https://github.com/grpc/grpc/blob/master/LICENSE</PackageLicenseUrl>
     <PackageProjectUrl>https://github.com/grpc/grpc</PackageProjectUrl>
     <PackageTags>gRPC RPC Protocol HTTP/2</PackageTags>

src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.csproj

@@ -6,7 +6,7 @@
   <PropertyGroup>
     <Authors>Google Inc.</Authors>
     <Copyright>Copyright 2015, Google Inc.</Copyright>
-    <Description>gRPC C# Health Checking Implementation</Description>
+    <Description>gRPC C# Health Checking (for Grpc.Core)</Description>
     <PackageLicenseUrl>https://github.com/grpc/grpc/blob/master/LICENSE</PackageLicenseUrl>
     <PackageProjectUrl>https://github.com/grpc/grpc</PackageProjectUrl>
     <PackageTags>gRPC health check</PackageTags>

src/csharp/Grpc.Reflection/Grpc.Reflection.csproj

@@ -6,7 +6,7 @@
   <PropertyGroup>
     <Authors>Google Inc.</Authors>
     <Copyright>Copyright 2016, Google Inc.</Copyright>
-    <Description>gRPC C# Reflection</Description>
+    <Description>gRPC C# Server Reflection (for Grpc.Core)</Description>
     <PackageLicenseUrl>https://github.com/grpc/grpc/blob/master/LICENSE</PackageLicenseUrl>
     <PackageProjectUrl>https://github.com/grpc/grpc</PackageProjectUrl>
     <PackageTags>gRPC reflection</PackageTags>

src/csharp/Grpc/Grpc.csproj

@@ -6,7 +6,7 @@
   <PropertyGroup>
     <Authors>Google Inc.</Authors>
     <Copyright>Copyright 2015, Google Inc.</Copyright>
-    <Description>C# implementation of gRPC - an RPC library and framework.</Description>
+    <Description>Metapackage for gRPC C#</Description>
     <PackageLicenseUrl>https://github.com/grpc/grpc/blob/master/LICENSE</PackageLicenseUrl>
     <PackageProjectUrl>https://github.com/grpc/grpc</PackageProjectUrl>
     <PackageTags>gRPC RPC Protocol HTTP/2</PackageTags>