BZ#2056337 Add opm migrate to the opm CLI tool reference

Author: michaelryanpeter

cli_reference/opm/cli-opm-ref.adoc

@@ -31,6 +31,7 @@ include::modules/opm-cli-ref-init.adoc[leveloffset=+1]
 include::modules/opm-cli-ref-render.adoc[leveloffset=+1]
 include::modules/opm-cli-ref-validate.adoc[leveloffset=+1]
 include::modules/opm-cli-ref-serve.adoc[leveloffset=+1]
+include::modules/opm-cli-ref-migrate.adoc[leveloffset=+1]
 include::modules/opm-cli-ref-index.adoc[leveloffset=+1]
 
 [role="_additional-resources"]

modules/opm-cli-ref-migrate.adoc

@@ -0,0 +1,27 @@
+// Module included in the following assemblies:
+//
+// * cli_reference/opm/cli-opm-ref.adoc
+
+[id="opm-cli-ref-migrate_{context}"]
+= migrate
+
+Migrate a SQLite database format index image or database file to a file-based catalog.
+
+:FeatureName: The SQLite-based catalog format, including the related CLI commands,
+include::modules/deprecated-feature.adoc[]
+
+.Command syntax
+[source,terminal]
+----
+$ opm  <index_ref> <output_dir> [<flags>]
+----
+
+.`migrate` flags
+[options="header",cols="1,3"]
+|===
+|Flag |Description
+
+|`-o`, `--output` (string)
+|Output format: `json` (the default value) or `yaml`.
+
+|===