[lldb] Replace None with std::nullopt in comments (NFC)

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

1 files changed, 1 insertions, 1 deletions

diff --git a/lldb/include/lldb/Target/Trace.h b/lldb/include/lldb/Target/Trace.h
index fc67a0e05ab4..987720e24e18 100644
--- a/lldb/include/lldb/Target/Trace.h
+++ b/lldb/include/lldb/Target/Trace.h
@@ -570,7 +570,7 @@ private:
     llvm::DenseMap<ConstString, uint64_t> live_process_data;
     /// \}
 
-    /// The list of cpus being traced. Might be \b None depending on the
+    /// The list of cpus being traced. Might be \b std::nullopt depending on the
     /// plug-in.
     std::optional<std::vector<lldb::cpu_id_t>> cpus;