doc: poetry lock --no-update

Resolves: #1614

Author: paavanb

docs/docs/cli.md

@@ -419,10 +419,18 @@ poetry search requests pendulum
 
 This command locks (without installing) the dependencies specified in `pyproject.toml`.
 
+!!!note
+
+     By default, this will lock all dependencies to the latest available compatible versions. To only refresh the lock file, use the `--no-update` option.
+
 ```bash
 poetry lock
 ```
 
+### Options
+
+* `--no-update`: Do not update locked versions, only refresh lock file.
+
 ## version
 
 This command shows the current version of the project or bumps the version of