[bug #62898] Document how to use variables to hide special characters

[Paul D. Smith]

Update of bug #62898 (project make):

                  Status:                    None => Fixed                  
             Assigned to:                    None => psmith                 
             Open/Closed:                    Open => Closed                 
       Component Version:                     SCM => 4.3                    
        Operating System:                    None => Any                    
           Fixed Release:                    None => SCM                    
           Triage Status:                    None => Small Effort           

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Follow-up Comment #2:

I decided to document this in the functions section since it's mostly related
to invoking functions.


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