Improve comments in code

Author: sharadraju

lib/errors.js

@@ -161,7 +161,8 @@ const ERR_INVALID_SID = 519;
 const ERR_TNS_NAMES_FILE_MISSING = 520;
 const ERR_CONNECTION_EOF = 521;
 
-// define mapping for ODPI-C errors that need to be wrapped with NJS errors
+// define mapping for ODPI-C, OCI & ORA errors that need to be wrapped
+// with NJS errors
 const adjustErrorXref = new Map();
 adjustErrorXref.set("DPI-1010", ERR_CONNECTION_CLOSED);
 adjustErrorXref.set("DPI-1024", [ERR_INVALID_COLL_INDEX_GET, 'at index ([0-9]+) does']);

lib/settings.js

@@ -69,7 +69,7 @@ class Settings {
   // database are returned as though they used the JavaScript time zone
   // setting. TIMESTAMP WITH TIME ZONE and TIMESTAMP WITH LOCAL TIME ZONE data
   // are returned in native JavaScript format (since they contain time zone
-  // information).
+  // information). This is used only in Thick mode (from node-oracledb 6.0.0).
   //---------------------------------------------------------------------------
   _getDateComponents(useLocal, date) {
     if (useLocal) {