Fix: typo

docs/awstats_config.html

@@ -1350,7 +1350,7 @@
 4.1+ for ShowSessionsStats, ShowKeywordsStats<br>
 5.1+ for all letters codes<br>
 5.5+ for ShowDaysOfMonthStats<br>
-5.6+ for ShowMiscStats,ShowSTMPErrorsStats<br>
+5.6+ for ShowMiscStats,ShowSMTPErrorsStats<br>
 5.8+ for ShowClusterStats<br>
 6.0+ for ShowWormsStats<br>
 6.4+ for ShowSummary<br>7.0+ for ShowDownloadsStats<br>