Update timer tcl command doc. Closes #808

doc/sphinx_source/mainDocs/tcl-commands.rst

@@ -2128,7 +2128,7 @@ maskhost <nick!user@host> [masktype]
 timer <minutes> <tcl-command> [count]
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-  Description: executes the given Tcl command after a certain number of minutes have passed. If count is specified, the command will be executed count times with the given interval in between. If you specify a count of 0, the timer will repeat until it's removed with killtimer or until the bot is restarted.
+  Description: executes the given Tcl command after a certain number of minutes have passed, at the top of the minute (ie, if a timer is started at 10:03:34 with 1 minute specified, it will execute at 10:04:00. If a timer is started at 10:06:34 with 2 minutes specified, it will execute at 10:08:00). If count is specified, the command will be executed count times with the given interval in between. If you specify a count of 0, the timer will repeat until it's removed with killtimer or until the bot is restarted.
 
   Returns: a timerID