Replace "pre-release" with "release" in the longitudinal intro

datasets/batch_view/longitudinal/intro.md

@@ -24,7 +24,7 @@ In summary, the longitudinal table differs from `main_summary` in two important
 * The longitudinal dataset groups all data so that one row represents a client_id
 * The longitudinal dataset samples to 1% of all client_ids
 
-Please note that this dataset only contains pre-release (or opt-out) histograms and scalars.
+Please note that this dataset only contains release (or opt-out) histograms and scalars.
 
 #### Accessing the Data