SW-202 add more descriptive comments and fix spelling

main.py

@@ -116,11 +116,11 @@ model_to_multilingual_wer = dict(
 # Add English WER and Multilingual WER to performance_df
 benchmark_df["english_wer"] = benchmark_df["model"].map(model_to_english_wer)
 benchmark_df["multilingual_wer"] = benchmark_df["model"].map(model_to_multilingual_wer)
-benchmark_df.fillna({"multilingual_wer": "N/A"}, inplace=True)
+benchmark_df.fillna({"multilingual_wer": "N/A"}, inplace=True) # Mark all untested models as N/A
 
-# Set multilingual_wer to "English Only Model" for English-only models
+# Mark English-only models
 english_only_mask = benchmark_df["model"].str.contains(r"\.en$|distil-whisper", case=False, na=False)
-benchmark_df.loc[english_only_mask, "multilingual_wer"] = "English Only Model"
+benchmark_df.loc[english_only_mask, "multilingual_wer"] = "English-only model"
 
 benchmark_df["multilingual_wer"] = benchmark_df["multilingual_wer"].astype(str)