Apply suggestions from code review

Co-authored-by: Eberhard Beilharz <ermshiperete@users.noreply.github.com>

Author: mcdurdin

script/statistics/annual-statistics.inc.php

@@ -7,7 +7,8 @@
 
   namespace Keyman\Site\com\keyman\api;
 
-  // strip out repeated columns with numeric keys
+  // strip out repeated columns with numeric keys (by default the results returned
+  // give each column twice, once with a column name, and once with a column index)
   function filter_columns_by_name($data) {
     $result = [];
     foreach($data as $row) {

tools/db/build/annual-statistics.sql

@@ -52,7 +52,7 @@ CREATE PROCEDURE sp_keyboard_downloads_by_month_statistics (
     month(statdate) Month,
     year(statdate) Year,
     sum(count) RawKeyboardDownloadCount,
-	sum(count)/day(eomonth(datefromparts(year(statdate),month(statdate),1))) DownloadsPerDay
+    sum(count)/day(eomonth(datefromparts(year(statdate),month(statdate),1))) DownloadsPerDay
   from kstats.t_keyboard_downloads
   WHERE statdate >= @prmStartDate AND statdate < @prmEndDate
   group by month(statdate), year(statdate)