Update checked-in C# generated code (#9158)

This change fixes the test that verifies that the checked-in generated
code for descriptor.proto is up to date.

csharp/src/AddressBook/Addressbook.cs

@@ -32,9 +32,10 @@ namespace Google.Protobuf.Examples.AddressBook {
             "Eg4KBm51bWJlchgBIAEoCRIoCgR0eXBlGAIgASgOMhoudHV0b3JpYWwuUGVy",
             "c29uLlBob25lVHlwZSIrCglQaG9uZVR5cGUSCgoGTU9CSUxFEAASCAoESE9N",
             "RRABEggKBFdPUksQAiIvCgtBZGRyZXNzQm9vaxIgCgZwZW9wbGUYASADKAsy",
-            "EC50dXRvcmlhbC5QZXJzb25CZgobY29tLmV4YW1wbGUudHV0b3JpYWwucHJv",
-            "dG9zQhFBZGRyZXNzQm9va1Byb3Rvc1ABWgsuLi90dXRvcmlhbKoCJEdvb2ds",
-            "ZS5Qcm90b2J1Zi5FeGFtcGxlcy5BZGRyZXNzQm9va2IGcHJvdG8z"));
+            "EC50dXRvcmlhbC5QZXJzb25ClQEKG2NvbS5leGFtcGxlLnR1dG9yaWFsLnBy",
+            "b3Rvc0IRQWRkcmVzc0Jvb2tQcm90b3NQAVo6Z2l0aHViLmNvbS9wcm90b2Nv",
+            "bGJ1ZmZlcnMvcHJvdG9idWYvZXhhbXBsZXMvZ28vdHV0b3JpYWxwYqoCJEdv",
+            "b2dsZS5Qcm90b2J1Zi5FeGFtcGxlcy5BZGRyZXNzQm9va2IGcHJvdG8z"));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.WellKnownTypes.TimestampReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(null, null, new pbr::GeneratedClrTypeInfo[] {

csharp/src/Google.Protobuf/Reflection/Descriptor.cs

@@ -10101,7 +10101,7 @@ namespace Google.Protobuf.Reflection {
         /// location.
         ///
         /// Each element is a field number or an index.  They form a path from
-        /// the root FileDescriptorProto to the place where the definition.  For
+        /// the root FileDescriptorProto to the place where the definition occurs.  For
         /// example, this path:
         ///   [ 4, 3, 2, 7, 1 ]
         /// refers to: