[Metrics] [Docs] Add section about device placement (#5280)
[Metrics] [Docs] Add section about device placement (#5280)

* update docs

* Update docs/source/metrics.rst

Co-authored-by: Shreeyak <bfdcf4fe6485439255378027765f518ae0164c51@gmail.com>

* Update docs/source/metrics.rst

Co-authored-by: Shreeyak <bfdcf4fe6485439255378027765f518ae0164c51@gmail.com>

* Update docs/source/metrics.rst

Co-authored-by: Shreeyak <bfdcf4fe6485439255378027765f518ae0164c51@gmail.com>

* Update docs/source/metrics.rst

* Update docs/source/metrics.rst

* Update docs/source/metrics.rst

* Apply suggestions from code review

Co-authored-by: Adrian Wälchli <5b4e4cffa129a3d56e8f9fb9c37adfa57835aadb@gmail.com>

* Update docs/source/metrics.rst

Co-authored-by: Jirka Borovec <b903e28b3fb12ead55c25f3a7816376be3bd063c@users.noreply.github.com>

* Update docs/source/metrics.rst

* Update docs/source/metrics.rst

* try fix failing doc test

Co-authored-by: Roger Shieh <94a0fc951021f0aeaf178c5819fc3fcbb34757bd@protonmail.ch>
Co-authored-by: Shreeyak <bfdcf4fe6485439255378027765f518ae0164c51@gmail.com>
Co-authored-by: Rohit Gupta <cb3c4569854e7764e66b4cfd98eab60a0e5fb067@gmail.com>
Co-authored-by: Adrian Wälchli <5b4e4cffa129a3d56e8f9fb9c37adfa57835aadb@gmail.com>
Co-authored-by: Jirka Borovec <b903e28b3fb12ead55c25f3a7816376be3bd063c@users.noreply.github.com>
(cherry picked from commit dabfeca92e0702e55f09ac53e9412672cd258cd3)

williamFalcon/pytorch-lightning,williamFalcon/pytorch-lightning