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Remove note about future work with UDFs + docs (#583) 

We have no plans to publish the UDFs to DTMO (mozilla/bigquery-etl#228)
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src/cookbooks/bigquery/querying.md
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@ -154,7 +154,7 @@ You can create views in BigQuery if you have access via [GCP BigQuery Console](a
BigQuery offers [user-defined functions](https://cloud.google.com/bigquery/docs/reference/standard-sql/user-defined-functions) (UDFs) that can be defined in SQL or JavaScript as part of a query or as a persistent function stored in a dataset. We have defined a suite of public persistent functions to enable transformations specific to our data formats, available in [`mozfun`](https://mozilla.github.io/bigquery-etl/). UDFs used internally in `moz-fx-data-shared-prod` are available in datasets `udf` (for functions defined in SQL) and `udf_js` (for functions defined in JavaScript). Note that JavaScript functions are potentially much slower than those defined in SQL, so use functions in `udf_js` with some caution, likely only after performing aggregation in your query.
We document a few of the most broadly useful UDFs below, but you can see the full list of `mozfun` UDFs in [https://mozilla.github.io/bigquery-etl](https://mozilla.github.io/bigquery-etl/) and or UDFs with source code used within `moz-fx-data-shared-prod` in [`bigquery-etl/sql/moz-fx-data-shared-prod/udf`](https://github.com/mozilla/bigquery-etl/tree/master/sql/moz-fx-data-shared-prod/udf) and [`bigquery-etl/sql/moz-fx-data-shared-prod/udf_js`](https://github.com/mozilla/bigquery-etl/tree/master/sql/moz-fx-data-shared-prod/udf_js). Publishing a full reference page for our persistent UDFs is a planned improvement, tracked in [`bigquery-etl#228`](https://github.com/mozilla/bigquery-etl/issues/228).
We document a few of the most broadly useful UDFs below, but you can see the full list of `mozfun` UDFs in [https://mozilla.github.io/bigquery-etl](https://mozilla.github.io/bigquery-etl/) and or UDFs with source code used within `moz-fx-data-shared-prod` in [`bigquery-etl/sql/moz-fx-data-shared-prod/udf`](https://github.com/mozilla/bigquery-etl/tree/master/sql/moz-fx-data-shared-prod/udf) and [`bigquery-etl/sql/moz-fx-data-shared-prod/udf_js`](https://github.com/mozilla/bigquery-etl/tree/master/sql/moz-fx-data-shared-prod/udf_js).
## Accessing map-like fields