How to clear the name cache of brainpy?

[CloudyDory]

BrainPy has inconsistent guide on how to clear the name cache in the code and documentation, and it seems that none of them work.

For example:

1. In brainpy/_src/math/object_transform/naming.py:

   f'In BrainPy, each object should have a unique name. '
   f'However, we detect that {obj} has a used name "{name}". \n'
   f'If you try to run multiple trials, you may need \n\n'
   f'>>> brainpy.brainpy_object.clear_name_cache() \n\n'
   f'to clear all cached names. '

2. In https://brainpy.readthedocs.io/en/latest/tutorial_advanced/base_and_collector.html, section "The naming system":

   
   UniqueNameError : In BrainPy, each object should have a unique name. However, we detect that <__main__.FHN object at 0x0000013BEA0DDF10> has a used name "Y". 
   If you try to run multiple trials, you may need 

brainpy.base.clear_name_cache()

to clear all cached names.

3. In https://brainpy.readthedocs.io/en/latest/tutorial_building/customize_dynamical_systems.html, section "1. A systematic naming system.": same as point 2.

However, it seems that the correct command should be `brainpy.math.clear_name_cache()`. Hope the code and documentation could be updated.

[chaoming0625]

This verbose message is wrong.Yes, We should use brainpy.math.clear_name_cache(). Thanks for the report.

[chaoming0625]

Has been revised in #681.