Improve error messages

Co-authored-by: kadir çetinkaya <[email protected]>

Author: someoneinjd

clang-tools-extra/clangd/Protocol.cpp

@@ -545,8 +545,8 @@ bool fromJSON(const llvm::json::Value &Params, ClientCapabilities &R,
     }
     if (auto *OffsetEncoding = Experimental->get("offsetEncoding")) {
       R.PositionEncodings.emplace();
-      elog("UTF-8 offsets extension is used to set PositionEncodings, which is "
-           "deprecated. Migrate to standard positionEncodings request");
+      elog("offsetEncoding capability is a deprecated clangd extension that'll go away with clangd 23.  "
+           "Migrate to standard positionEncodings capability introduced by LSP 3.17");
       if (!fromJSON(*OffsetEncoding, *R.PositionEncodings,
                     P.field("offsetEncoding")))
         return false;