Add API to new classes in vector module to documenation

[friyaz]

Adding the API of classes and functions for vector integration to documentation.

References to other Issues or PRs

Brief description of what is fixed or changed

Other comments

Release Notes

NO ENTRY

[sympy-bot]

✅

Hi, I am the SymPy bot (v160). I'm here to help you write a release notes entry. Please read the guide on how to write release notes.

• No release notes entry will be added for this pull request.

Note: This comment will be updated with the latest check if you edit the pull request. You need to reload the page to see it.

Click here to see the pull request description that was parsed.

<!-- Your title above should be a short description of what
was changed. Do not include the issue number in the title. -->
Adding the API of classes and functions for vector integration to documentation.
#### References to other Issues or PRs
<!-- If this pull request fixes an issue, write "Fixes #NNNN" in that exact
format, e.g. "Fixes #1234" (see
https://tinyurl.com/auto-closing for more information). Also, please
write a comment on that issue linking back to this pull request once it is
open. -->


#### Brief description of what is fixed or changed


#### Other comments


#### Release Notes

<!-- Write the release notes for this release below. See
https://github.com/sympy/sympy/wiki/Writing-Release-Notes for more information
on how to write release notes. The bot will check your release notes
automatically to see if they are formatted correctly. -->

<!-- BEGIN RELEASE NOTES -->
NO ENTRY
<!-- END RELEASE NOTES -->

[codecov]

Codecov Report

Merging #20000 into master will increase coverage by 4.441%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##            master    #20000       +/-   ##
=============================================
+ Coverage   71.411%   75.852%   +4.441%     
=============================================
  Files          669       669               
  Lines       173512    173512               
  Branches     40956     40956               
=============================================
+ Hits        123907    131614     +7707     
+ Misses       43742     36166     -7576     
+ Partials      5863      5732      -131     

[Upabjojr]

Hi, that's good. We need some examples of usage applied to some practical purposes (for example, physics, electromagnetism, etc...). Do you have any?

[friyaz]

Hello. I think I will make a separate PR for the examples. Is it fine?

[Upabjojr]

Hello. I think I will make a separate PR for the examples. Is it fine?

OK