[doc] Major revision to the field (advanced) document (#4156)
[doc] Major revision to the field (advanced) document (#4156)

* Major revision to the field (adv) document.

* remove redundant

Co-authored-by: Bo Qiao <39deb40d7ab24109694672d5801cf702b89be421@taichi.graphics>

* Apply suggestions from Bo's code review

Co-authored-by: Bo Qiao <39deb40d7ab24109694672d5801cf702b89be421@taichi.graphics>

* Merge review suggestions from Bo.

* Formatting

* Update with xiuqi's review

Co-authored-by: rocket <2198f81fa562d95efa011139ff33af8096f4d62e@users.noreply.github.com>

* Merge comments from Bo's review

Co-authored-by: Bo Qiao <39deb40d7ab24109694672d5801cf702b89be421@taichi.graphics>

* Apply suggestions from Bo's excellent code review

Co-authored-by: Bo Qiao <39deb40d7ab24109694672d5801cf702b89be421@taichi.graphics>

* Apply suggestions from Bo's excellent code review

Co-authored-by: Bo Qiao <39deb40d7ab24109694672d5801cf702b89be421@taichi.graphics>

* slightly rephase the sentences in packed mode.

* Auto Format

* rephrase-2

* Auto Format

Co-authored-by: Bo Qiao <39deb40d7ab24109694672d5801cf702b89be421@taichi.graphics>
Co-authored-by: rocket <2198f81fa562d95efa011139ff33af8096f4d62e@users.noreply.github.com>
Co-authored-by: Taichi Gardener <52844ac7498fba84f633481a7c3ae54491811c81@gmail.com>
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi