Update the documentation for SFDX_ORG_CREATE_ARGS environment variable (#3861)

Co-authored-by: Bharath Chadarajupalli <vchadarajupalli@salesforce.com>

Author: lakshmi2506

docs/env-var-reference.md

@@ -70,3 +70,7 @@ org, e.g. a Dev Hub. Set with SFDX_CLIENT_ID.
 ## `SFDX_ORG_CREATE_ARGS`
 
 Extra arguments passed to `sf org create scratch`.
+
+To provide additional arguments, use the following format. For instance, to set the release to "preview", the environment variable would be: "--release=preview"
+
+To specify multiple options, you can include them together, like: "--edition=developer --release=preview"