rustdoc: remove no-op CSS nav.sub { font-size: 1rem }
          #103268
        
          
      
                
     Merged
            
            
          
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This rule originated as a
font-size: 16px, when body hadfont-size: 13pxset in 4fd061c.It remained even when body's font size was bumped up to 16px, 4d5f4ff, making the rule a no-op, and was carried forward when it was converted to 1rem in cc18120.