Update DataFrame.jl

format docs

Author: emfeltham

src/DataFrame.jl

@@ -4,9 +4,11 @@ import DataFrames.DataFrame
     DataFrame(gr::T; type = :node) where T <:AbstractMetaGraph
 
 Construct a DataFrame from a MetaGraph from either its node or edge properties.
+
 `gr` is a MetaGraph.
 `type` is a Symbol valued either :node or :edge such that the DataFrame is populated with node or edge
 properties stored in `gr`.
+
 """
 function DataFrame(gr::T; type = :node) where T <:AbstractMetaGraph
     fl, prps, en, nu = if type == :node