Add id for bookmark

Add "id" for $BookMark = 'SelectContract'.

doc/Manual/ManualContracts.html

@@ -34,7 +34,7 @@ <h3><a id="CreateContract">Creating a New Contract</a></h3>
 
 <p>The sum of the cost of the bill of materials together with the total cost of the other requirements is shown as the total contract cost. This cost is used together with the GP % entered to work out the total contract cost. The GP% is the % of the total contract price that is profit - so 1 minus the GP% is % of the total contract price that is the cost. The calculation is therefore - contract total cost divided by (1 - the GP%).</p>
 
-<h3>Selecting A Contract</h3>
+<h3><a id="SelectContract">Selecting A Contract</a></h3>
 
 <p>From the Contracts tab of the main menu, Select Contract allows contracts for a specific customer to be selected, or contracts of a specific status. Contracts can have a status of:</p>