Revert "Update time format to iso8601 (#389)" (#396)

This reverts commit 53d615b.

Author: Sevenannn

spiceaidocs/docs/reference/spicepod/datasets.md

@@ -132,19 +132,18 @@ Required to enable a retention policy on the dataset.
 ## `time_format`
 
 Optional. The format of the `time_column`. The following values are supported:
-
 - `timestamp` - Default. Timestamp without a timezone. E.g. `2016-06-22 19:10:25` with data type `timestamp`.
 - `timestamptz` - Timestamp with a timezone. E.g. `2016-06-22 19:10:25-07` with data type `timestamptz`.
 - `unix_seconds` - Unix timestamp in seconds. E.g. `1718756687`.
 - `unix_millis` - Unix timestamp in milliseconds. E.g. `1718756687000`.
-- `iso8601` - [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format.
+- `ISO8601` - [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format.
 
 Spice emits a warning if the `time_column` from the data source is incompatible with the `time_format` config.
 
 :::warning[Limitations]
 
 - String-based columns are assumed to be ISO8601 format.
-  :::
+:::
 
 ## `acceleration`
 
@@ -196,7 +195,7 @@ Must be of the form `SELECT * FROM {name} WHERE {refresh_filter}`. `{name}` is t
 - The refresh SQL only supports filtering data from the current dataset - joining across other datasets is not supported.
 - Selecting a subset of columns isn't supported - the refresh SQL needs to start with `SELECT * FROM {name}`.
 - Queries for data that have been filtered out will not fall back to querying against the federated table.
-  :::
+:::
 
 ## `acceleration.refresh_data_window`