Update waitfor-transact-sql.md

Include formatting information for time_to_pass and time_to_execute.

Author: BraveJhawk

docs/t-sql/language-elements/waitfor-transact-sql.md

@@ -60,13 +60,13 @@ WAITFOR
  Is the specified period of time that must pass, up to a maximum of 24 hours, before execution of a batch, stored procedure, or transaction proceeds.  
 
  '*time_to_pass*'  
- Is the period of time to wait. *time_to_pass* can be specified in one of the acceptable formats for **datetime** data, or it can be specified as a local variable. Dates cannot be specified; therefore, the date part of the **datetime** value is not allowed.  
+ Is the period of time to wait. *time_to_pass* can be specified in one of the acceptable formats for **datetime** data, or it can be specified as a local variable. Dates cannot be specified; therefore, the date part of the **datetime** value is not allowed. This is formatted as hh:mm[[:ss].mss].
 
  TIME  
  Is the specified time when the batch, stored procedure, or transaction runs.  
 
  '*time_to_execute*'  
- Is the time at which the WAITFOR statement finishes. *time_to_execute* can be specified in one of the acceptable formats for **datetime** data, or it can be specified as a local variable. Dates cannot be specified; therefore, the date part of the **datetime** value is not allowed.  
+ Is the time at which the WAITFOR statement finishes. *time_to_execute* can be specified in one of the acceptable formats for **datetime** data, or it can be specified as a local variable. Dates cannot be specified; therefore, the date part of the **datetime** value is not allowed. This is formatted as hh:mm[[:ss].mss] and can optionally include the date of 1900-01-01.
 
  *receive_statement*  
  Is a valid RECEIVE statement.