Improve comment in assertions.jl

Author: juliohm

src/assertions.jl

@@ -2,7 +2,7 @@
 # Licensed under the MIT License. See LICENSE in the project root.
 # ------------------------------------------------------------------
 
-# assert that all columns of table are Continuous
+# assert that all columns are continuous
 function assert_continuous(table)
   types = schema(table).scitypes
   @assert all(T <: Continuous for T in types) "columns must hold continuous variables"