TYP: added explanation of the join methods within df.align
- closes #53092 

Added type annotations of the join methods within df.align - ([here](https://github.com/Antony-evm/pandas-aevmorfop/blob/0.21.x/pandas/core/generic.py))

from  join : {{'outer', 'inner', 'left', 'right'}}, default 'outer'
           
To
 join : {{'outer', 'inner', 'left', 'right'}}, default 'outer'
 Type of alignment to be performed.

            left: use only keys from left frame, preserve key order.
            right: use only keys from right frame, preserve key order.
            outer: use union of keys from both frames, sort keys lexicographically.
            inner: use intersection of keys from both frames, preserve the order of the left keys.



/preview Website preview of this PR available at: https://pandas.pydata.org/preview/53101/ Im getting this error with the proposed changes and I fail to see how this could be caused by the documentation:
_error    libmamba Bad conversion of configurable 'remote_connect_timeout_secs' from source '~/.condarc' : yaml-cpp: error at line 14, column 30: bad conversion_

Any ideas? Is it a common issue?
 Looks like theres a doc issue: 
```
2023-05-08T16:12:06.8973871Z /home/runner/work/pandas/pandas/pandas/core/generic.py:docstring of pandas.core.generic.NDFrame.align:13: WARNING: Bullet list ends without a blank line; unexpected unindent.
2023-05-08T16:12:06.8974978Z /home/runner/work/pandas/pandas/pandas/core/generic.py:docstring of pandas.core.generic.NDFrame.align:13: WARNING: Bullet list ends without a blank line; unexpected unindent.
```

Also no need to worry about that warning > Looks like theres a doc issue:
> 
> ```
> 2023-05-08T16:12:06.8973871Z /home/runner/work/pandas/pandas/pandas/core/generic.py:docstring of pandas.core.generic.NDFrame.align:13: WARNING: Bullet list ends without a blank line; unexpected unindent.
> 2023-05-08T16:12:06.8974978Z /home/runner/work/pandas/pandas/pandas/core/generic.py:docstring of pandas.core.generic.NDFrame.align:13: WARNING: Bullet list ends without a blank line; unexpected unindent.
> ```
> 
> Also no need to worry about that warning

Thank you for this - the last line of the list should have been indented apparently. Fixed it and it should be ready to close now. If you could point me to where to look in the logs next time, I'd appreciate it as I spent some time trying to find the error and couldn't find the above for the life of me.

PS: Im quite new to git/github. Apologies for closing/reopening - thought this action would merge the pull request to the main branch.  Thanks @Antony-evm 