Update semantic-models.md (#4264)

Closes #4127

## What are you changing in this pull request and why?

Removes "optional" and adds default for `create_metric`

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Removing or renaming existing pages (delete if not applicable):
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website/docs/docs/build/semantic-models.md

@@ -232,8 +232,7 @@ For semantic models with a measure, you must have a [primary time group](/docs/b
 | `agg` | dbt supports the following aggregations: `sum`, `max`, `min`, `count_distinct`, and `sum_boolean`. | Required |
 | `expr` | You can either reference an existing column in the table or use a SQL expression to create or derive a new one. | Optional |
 | `non_additive_dimension` | Non-additive dimensions can be specified for measures that cannot be aggregated over certain dimensions, such as bank account balances, to avoid producing incorrect results. | Optional |
-| `create_metric`* | You can create a metric directly from a measure with create_metric: True and specify its display name with create_metric_display_name. | Optional |
-_*Coming soon_
+| `create_metric` | You can create a metric directly from a measure with `create_metric: True` and specify its display name with create_metric_display_name. Default is false. | Optional |
 
 
 import SetUpPages from '/snippets/_metrics-dependencies.md';