[GSoC] Changed namespace of joint_rv_types

[czgdp1807]

References to other Issues or PRs

[1] #16893

Brief description of what is fixed or changed

Other comments

Release Notes

• stats
  • joint_rv_types can now be imported with from sympy.stats import *

[sympy-bot]

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• stats
  • joint_rv_types can now be imported with from sympy.stats import * (#16919 by @czgdp1807)

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#### References to other Issues or PRs
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[1] https://github.com/sympy/sympy/pull/16893

#### Brief description of what is fixed or changed
#### Other comments
#### Release Notes

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<!-- BEGIN RELEASE NOTES -->
* stats
  * joint_rv_types can now be imported with `from sympy.stats import *`
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[codecov]

Codecov Report

Merging #16919 into master will increase coverage by 0.008%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##            master    #16919       +/-   ##
=============================================
+ Coverage   73.923%   73.931%   +0.008%     
=============================================
  Files          620       620               
  Lines       160207    160211        +4     
  Branches     37599     37599               
=============================================
+ Hits        118431    118447       +16     
+ Misses       36297     36281       -16     
- Partials      5479      5483        +4

[czgdp1807]

ping @sidhantnagpal @Upabjojr Can it be merged?

[sidhantnagpal]

Looks fine to me.