Merge pull request #1 from GlenHertz/gh/slice_sample_docs

fix(slice docs): slice_sample(n=5)

Author: GlenHertz

docs/examples/UserGuide/slice.jl

@@ -64,7 +64,7 @@ end
 # ## Sample 5 random rows in the data frame
 
 @chain df begin
-  @slice_sample(5)
+  @slice_sample(n=5)
 end
 
 # ## Slice the min
@@ -99,4 +99,4 @@ end
 
 @chain df begin 
   @slice_head(n = 3)
-end
+end