tx fees, policy: doc: update and delete unnecessary comment

Author: ismaelsadeeq

src/policy/fees.cpp

@@ -548,14 +548,12 @@ CBlockPolicyEstimator::CBlockPolicyEstimator(const fs::path& estimation_filepath
 
     AutoFile est_file{fsbridge::fopen(m_estimation_filepath, "rb")};
 
-    // Whenever the fee estimation file is not present return early
     if (est_file.IsNull()) {
         LogPrintf("%s is not found. Continue anyway.\n", fs::PathToString(m_estimation_filepath));
         return;
     }
 
     std::chrono::hours file_age = GetFeeEstimatorFileAge();
-    // fee estimate file must not be too old to avoid wrong fee estimates.
     if (file_age > MAX_FILE_AGE && !read_stale_estimates) {
         LogPrintf("Fee estimation file %s too old (age=%lld > %lld hours) and will not be used to avoid serving stale estimates.\n", fs::PathToString(m_estimation_filepath), Ticks<std::chrono::hours>(file_age), Ticks<std::chrono::hours>(MAX_FILE_AGE));
         return;

src/policy/fees.h

@@ -25,8 +25,9 @@
 // How often to flush fee estimates to fee_estimates.dat.
 static constexpr std::chrono::hours FEE_FLUSH_INTERVAL{1};
 
-/** fee_estimates.dat that are more than 60 hours (2.5 days) will not be read,
- * as the estimates in the file are stale.
+/** fee_estimates.dat that are more than 60 hours (2.5 days) old will not be read,
+ * as fee estimates are based on historical data and may be inaccurate if
+ * network activity has changed.
  */
 static constexpr std::chrono::hours MAX_FILE_AGE{60};