[llvm] [lldb][Windows] add release notes for lldb-server (PR #209415)

[via llvm-commits]

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@@ -483,6 +479,8 @@ Makes programs 10x faster by doing Special New Thing.
 * Python 3.11 or later is now recommended for building LLDB 23 on Windows. From LLDB 24, Python 3.11 or later will be required.
 * Messages from `OutputDebugString[A|W]` are now shown inline when using LLDB
   from the command-line and in the output window when using lldb-dap.
+* lldb-server.exe is now the default plugin, replacing and deprecating the
+  "in-process" plugin.
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Nerixyz wrote:

Can you rephrase this to be easier to understand for users not familiar with LLDB's plugin model and include the env variable?

I haven't come up with a good note. What about:

- For local debugging on Windows, LLDB now spawns `lldb-server.exe` which will run the debuggee as opposed to running it "in-process". You can disable this by setting the environment variable `LLDB_USE_LLDB_SERVER=0`.

https://github.com/llvm/llvm-project/pull/209415