Add header for chisel-enum.md (#1800)

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diff --git a/docs/src/explanations/chisel-enum.md b/docs/src/explanations/chisel-enum.md
index c4ee6af6..cb017239 100644
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+---                                                                                                                                                                             
+layout: docs
+title:  "Enumerations"
+section: "chisel3"
+---
+
 # ChiselEnum
 
 The ChiselEnum type can be used to reduce the chance of error when encoding mux selectors, opcodes, and functional unit operations. In contrast with`Chisel.util.Enum`, `ChiselEnum` are subclasses of `Data`, which means that they can be used to define fields in `Bundle`s, including in `IO`s.