Update convert docsting to mention -y and -g global flags. (#7210)

Replaces #7199. 

No need to add a `--force` flag, but would be nice to make the user more
aware. This is a natural place to mention it.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Dylan Madisetti <[email protected]>
Co-authored-by: Akshay Agrawal <[email protected]>

Author: 4 people

marimo/_cli/convert/commands.py

@@ -62,6 +62,12 @@ def convert(
 
         marimo convert script.py -o your_nb.py
 
+    You can also pass global flags to the main marimo command.
+    For example, use `-q` to suppress output or `-y`
+    to automatically accept all prompts of the command.
+
+        marimo -q -y convert script.py -o your_nb.py
+
     After conversion:
 
         marimo edit your_nb.py