Improve the readability of the TableProperties::ToString()

db/table_properties_collector.cc

@@ -74,7 +74,7 @@ std::string TableProperties::ToString(
   );
   AppendProperty(
       result,
-      "(estimated) table size=",
+      "(estimated) table size",
       data_size + index_size + filter_size,
       prop_delim,
       kv_delim

table/block_based_table_builder.cc

@@ -530,8 +530,8 @@ Status BlockBasedTableBuilder::Finish() {
     Log(
         r->options.info_log,
         "Table was constructed:\n"
-        "  basic properties: %s\n"
+        "  [basic properties]: %s\n"
-        "  user collected properties: %s",
+        "  [user collected properties]: %s",
         r->props.ToString().c_str(),
         user_collected.c_str()
     );