[docs] Mention `vsplit`, `hsplit` and `tensor_split` in Tensor views doc (#63191)

[docs] Mention `vsplit`, `hsplit` and `tensor_split` in Tensor views doc (#63191)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63191

**Summary**
This commit adds `vsplit`, `hsplit` and `tensor_split` to the list of
view ops on the Tensor Views documentation page.

**Test Plan**
Continuous integration.

*Before*
<img width="195" alt="Captura de Pantalla 2021-08-12 a la(s) 2 55 07 p  m" src="https://user-images.githubusercontent.com/4392003/129275921-c1cfdf6c-9f1f-45f3-98b6-1de7a0f0cc84.png">

*After*
<img width="197" alt="Captura de Pantalla 2021-08-12 a la(s) 2 55 15 p  m" src="https://user-images.githubusercontent.com/4392003/129275936-de4afde7-0143-4e1d-b38f-c86256f4896c.png">

**Fixes**
This commit fixes #62727.

Test Plan: Imported from OSS

Reviewed By: VitalyFedyunin

Differential Revision: D30293181

Pulled By: SplitInfinity

fbshipit-source-id: 283783a4ccc3ebc50cb0a427e55c7a6cb618ffd7