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* Fix ref to message-passing guide

* Fix pygments and spacing

* Update build documentation steps in README.md

* Use links

* Adjust parameters in SAGEConv docstring in same order as init

* Fix spelling error

* Change doc link

Co-authored-by: Quan (Andy) Gan <coin2028@hotmail.com>

* [Doc] Add CN chapter 5

* [Doc] Add CN 5.1

* [Doc] Add CN 5.2, 5.3, and 5.4 raw text

* [Doc] Add CN 5.2, 5.3, and 5.4 raw text

* [Doc] Put 5.1 CN parts

* [Doc] Put 5.2，5.3, and 5.4 raw CN parts

* [Doc] Fix linkage bugs.

* [Doc] 1st round of copyediting, Chapter5, 5.1, and part of 5.2

* [Doc] 2nd round of copyediting, removing EN parts.

* [Doc] 2nd round of copyediting, removing EN parts.

* [Doc] 2nd round of copyediting, removing EN parts.

* [Doc] 2nd round of copyediting, removing EN parts.

* [Doc] 3rd round of copyediting.

* [Doc] 4th round of copyediting to Minjie's comments.

* [Doc] 4th round of copyediting to Minjie's comments.

* [Doc] 4th round of copyediting to Minjie's comments.

* [Doc] 4th round of copyediting to Minjie's comments.

* [Doc] 4th round of copyediting to Minjie's comments.

* [Doc] 4th round of copyediting to Minjie's comments.

* [Doc] 5th round of copyediting to Murphy's comments.

* Update

* Update

* Update

* Update

* Update

* [bug][doc] Fix bug in batched heterograph training documentation

* added references of "above" with hyperlinks

* address comments

* fix API doc on EdgeDataLoader
Co-authored-by: Mufei Li <mufeili1996@gmail.com>