Remove space in #to_s between symbolic items

This makes example names look more like documentation by changing names 
like "Array #size is zero" to "Array#size is zero".

src/spectator/example.cr

@@ -50,7 +50,7 @@ module Spectator
     # The string can be given to end-users to identify the example.
     def to_s(io)
       @group.to_s(io)
-      io << ' '
+      io << ' ' unless symbolic? && @group.symbolic?
       io << what
     end
   end

src/spectator/nested_example_group.cr

@@ -106,7 +106,7 @@ module Spectator
     # ```
     def to_s(io)
       parent.to_s(io)
-      io << ' '
+      io << ' ' unless symbolic? && parent.symbolic?
       io << what
     end
   end