Fix typos

include/grpcpp/client_context.h

@@ -26,7 +26,7 @@
 ///
 /// Context settings are only relevant to the call they are invoked with, that
 /// is to say, they aren't sticky. Some of these settings, such as the
-/// compression options, can be made persistant at channel construction time
+/// compression options, can be made persistent at channel construction time
 /// (see \a grpc::CreateCustomChannel).
 ///
 /// \warning ClientContext instances should \em not be reused across rpcs.

include/grpcpp/impl/codegen/server_context.h

@@ -88,8 +88,8 @@ class ServerContextTestSpouse;
 ///
 /// Context settings are only relevant to the call handler they are supplied to,
 /// that is to say, they aren't sticky across multiple calls. Some of these
-/// settings, such as the compression options, can be made persistant at server
+/// settings, such as the compression options, can be made persistent at server
-/// construction time by specifying the approriate \a ChannelArguments
+/// construction time by specifying the appropriate \a ChannelArguments
 /// to a \a grpc::ServerBuilder, via \a ServerBuilder::AddChannelArgument.
 ///
 /// \warning ServerContext instances should \em not be reused across rpcs.