[clangd] Update remote index documentation

* Even though remote index is still somewhat experimental, it can now be
  used withing clangd itself: this should be the primary way of trying
  it out
* Remove `protobuf-compiler` from list of needed Debian packages as it
  `protobuf-compiler-grpc` already depends on it
* Bump recommended gRPC version to 1.32.3

diff --git a/clang-tools-extra/clangd/index/remote/README.md b/clang-tools-extra/clangd/index/remote/README.md
index b56b2fc..235e967 100644 (file)
--- a/clang-tools-extra/clangd/index/remote/README.md
+++ b/clang-tools-extra/clangd/index/remote/README.md
@@ -22,19 +22,20 @@ tools you will need to set this CMake flag — `-DCLANGD_ENABLE_REMOTE=On`.
 On Debian-like systems gRPC and Protobuf can be installed from apt:
 
 ```bash
-apt install libgrpc++-dev libprotobuf-dev protobuf-compiler protobuf-compiler-grpc
+apt install libgrpc++-dev libprotobuf-dev protobuf-compiler-grpc
 ```
 
 ### Building from sources
 
 Another way of installing gRPC and Protobuf is building from sources using
-CMake. The easiest way of doing that would be to choose a directory where you
-want to install so that the installation files are not copied to system root and
-you can uninstall gRPC or use different versions of the library.
+CMake (we need CMake config files to find necessary libraries in LLVM). The
+easiest way of doing that would be to choose a directory where you want to
+install so that the installation files are not copied to system root and you
+can easily uninstall gRPC or use different versions.
 
 ```bash
 # Get source code.
-$ git clone -b v1.28.1 https://github.com/grpc/grpc
+$ git clone -b v1.32.2 https://github.com/grpc/grpc
 $ cd grpc
 $ git submodule update --init
 # Choose directory where you want gRPC installation to live.
@@ -55,5 +56,5 @@ flag will inform build system that you chose this option —
 
 ## Running
 
-The remote index isn't usable with Clangd yet, but you can try the
-proof-of-concept tools in `client/` and `server/` subdirectories.
+You can run `clangd-index-server` and connect `clangd` instance to it using
+`--remote-index-address` and `--project-root` flags.