[doc] Improve type system documentation (#4002)
[doc] Improve type system documentation (#4002)

* Init change

* Update table with symbol

* Merge table with list

* Add f16

* Rephrase type promotion

* Rephrase type cast

* Rephrase type cast

* Rephrase some sentences

* Remove operations related part

* Auto Format

* Reorder and minor corrections

* Update docs/lang/articles/basic/type.md

Co-authored-by: Xiangyun Yang <50f2e388039c95f5970222081c9a456e1ecd2d63@users.noreply.github.com>

* Update type.md

* Update docs/lang/articles/basic/type.md

Co-authored-by: Vissidarte-Herman <bb38b48046b6557306e3b6798e1a0188f4c150c8@users.noreply.github.com>

* Update docs/lang/articles/basic/type.md

Co-authored-by: Vissidarte-Herman <bb38b48046b6557306e3b6798e1a0188f4c150c8@users.noreply.github.com>

* Update docs/lang/articles/basic/type.md

Co-authored-by: Vissidarte-Herman <bb38b48046b6557306e3b6798e1a0188f4c150c8@users.noreply.github.com>

* Update docs/lang/articles/basic/type.md

Co-authored-by: Vissidarte-Herman <bb38b48046b6557306e3b6798e1a0188f4c150c8@users.noreply.github.com>

* Auto Format

* Update type.md

* Update

* Update

* Auto Format

Co-authored-by: Taichi Gardener <52844ac7498fba84f633481a7c3ae54491811c81@gmail.com>
Co-authored-by: Xiangyun Yang <50f2e388039c95f5970222081c9a456e1ecd2d63@users.noreply.github.com>
Co-authored-by: Vissidarte-Herman <bb38b48046b6557306e3b6798e1a0188f4c150c8@users.noreply.github.com>
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi