Sphinx build 'TypeVar' object has no attribute '__mro__'

**Describe the bug**

Tried to add
```
.. autoclass:: forte.data.ontology.core.EntryType
:members:
```
into `docs/code/data.rst`

It gives error message as below
```
Sphinx build 'TypeVar' object has no attribute '__mro__'.
```
If this issue is solved, we are expected to have a valid hyperlink for `EntryType`, `LinkType`, `GroupType`, `PathLike` and `ElementType`.

Also, we can delete those names from `spelling_wordlist.txt` after it's solved.

**To Reproduce**
Steps to reproduce the behavior:
1. Prepare data `...`
2. Run command '....'
3. See error

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Environment (please complete the following information):**
- OS: [e.g. iOS]
- Version [e.g. 22]
- Python and Package verions: [e.g. Python version, Pytorch version]

**Additional context**
Add any other context about the problem here.

Start with the autoclass directive in docs/code/data.rst and run the Sphinx build to reproduce the TypeVar '__mro__' error for forte.data.ontology.core.EntryType. Trace how the documentation build handles EntryType, LinkType, GroupType, PathLike, and ElementType; done means valid hyperlinks are generated and their names can be removed from spelling_wordlist.txt.

Written by the indexing model from the issue text.