adjust databricks docs

docs/examples/UserGuide/databricks.jl

@@ -8,19 +8,36 @@
 # - Schema Name
 # - warehouse_id
 
+# One thing to note,
+# Since each time `db_table` runs, it runs a query to pull the metadata, you may choose to use run `db_table` and save the results, and use these results with `from_query()`. This will reduce the number of queries to your database and is illustrated below.
 
-# Connecting will then proceed as follows: 
 # ```julia
 # instance_id = "string_id"
 # token "string_token"
 # warehouse_id = "e673cd4f387f964a"
 # con = connect(:databricks, instance_id, token, "DEMODB", "PUBLIC", warehouse_id)
 # # After connection is established, a you may begin querying.
-# stable_table_metadata = db_table(con, "MTCARS")
+# stable_table_metadata = db_table(con, "mtcars")
 # @chain from_query(stable_table_metadata) begin
-#    @select(WT)
-#    @mutate(TEST = WT *2)
+#    @select(wt)
+#    @mutate(test = wt *2)
 #    #@aside @show_query _
 #    @collect
 # end
+# ```
+# ```
+#  32×2 DataFrame
+#  Row │ wt       test    
+# │ Float64  Float64 
+# ─────┼──────────────────
+# 1 │   2.62     5.24
+# 2 │   2.875    5.75
+# 3 │   2.32     4.64
+# 4 │   3.215    6.43
+# ⋮  │    ⋮        ⋮
+# 29 │   3.17     6.34
+# 30 │   2.77     5.54
+# 31 │   3.57     7.14
+# 32 │   2.78     5.56
+#      24 rows omitted
 # ```