Enhance Jupyter_CopySpec documentation with additional comments for enabling/disabling the copy spec button

Author: IKupriyanov-HORIS

devdocs/misc/Jupyter_CopySpec.md

@@ -1,4 +1,4 @@
-]# Debugging Jupyter Plots
+# Debugging Jupyter Plots
 Unlike debugging a demo application, debugging a plot specification from Jupyter allows for quick iteration and immediate feedback on changes.
 
 To obtain the plot specification as a JSON string in a Jupyter notebook, follow these steps:
@@ -18,6 +18,8 @@ The button’s visibility can be managed for all notebooks using the following m
 - `%toggle_copy_spec_button on` → Show the button
 - `%toggle_copy_spec_button off` → Hide the button
 
+These commands can be used in separate notebooks, such as `enable_copy_spec_button.ipynb` and `disable_copy_spec_button.ipynb`, to enable or disable the button for all notebooks.
+
 
 ### Removing the hook
 To remove the `_repr_html_` hook, delete the `50-lets-plot-hook.py` file from the IPython startup directory (usually `~/.ipython/profile_default/startup/`) and restart the kernel.