Updated CLI doc to provide info on stuck session error (#6620)

website/docs/docs/cloud/cloud-cli-installation.md

@@ -319,3 +319,10 @@ This alias will allow you to use the <code>dbt-cloud</code> command to invoke th
 If you've ran a dbt command and receive a <code>Session occupied</code> error, you can reattach to your existing session with <code>dbt reattach</code> and then press <code>Control-C</code> and choose to cancel the invocation.
 
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+<DetailsToggle alt_header="Why am I receiving a `Stuck session` error when trying to run a new command?">
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+The Cloud CLI allows only one command that writes to the data warehouse at a time. If you attempt to run multiple write commands simultaneously (for example, `dbt run` and `dbt build`), you will encounter a `stuck session` error. To resolve this, cancel the specific invocation by passing its ID to the cancel command. For more information, refer to [parallel execution](/reference/dbt-commands#parallel-execution).
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