[SQL] What does the new stored procedure default content mean?

When I create a new stored procedure I get an initial example of a stored procedure, what does this section mean? :

CREATE PROCEDURE <Procedure_Name, sysname, ProcedureName>
-- Add the parameters for the stored procedure here
<@Param1, sysname, @p1> <Datatype_For_Param1, , int> = <Default_Value_For_Param1, , 0>,
<@Param2, sysname, @p2> <Datatype_For_Param2, , int> = <Default_Value_For_Param2, , 0>


..... ...

I define my stored procedure like this:

CREATE PROCEDURE HumanResources.uspGetEmployees
@LastName nvarchar(50),
@FirstName nvarchar(50)


.....

So what does the above parameters and procedure name default syntax means? (by the way , the default text doesn't execute too).

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