minor: comments

common/ngram-map.cpp

@@ -23,7 +23,7 @@ llama_tokens common_ngram_simple_draft(
         common_ngram_simple_state & state,
         const llama_tokens & tokens, llama_token sampled) {
 
-    // Simple implementation of self-speculative decoding without draft model, without ngram-map.
+    // Simple implementation of self-speculative decoding without a draft model.
     //
     const size_t cur_len = tokens.size();
     // Only check every check_rate tokens to save compute

common/speculative.cpp

@@ -119,7 +119,7 @@ struct common_speculative_state {
     // TODO: track performance of most recent calls
     const bool gen_perf = true; // whether to generate performance stats.
 
-    int64_t gen_duration_us = 0; // total time spent in this implementation in milliseconds.
+    int64_t gen_duration_us = 0; // total time spent in this implementation in microseconds.
 
     virtual ~common_speculative_state() = default;