Added developer documents using doxygen

[Aniket-debug]

Fixes # 972

Changes proposed in this pull request:

• added developer doc of get_check_data.h
• added developer doc of get_check_data.c

[cvvergara]

Hi @Aniket-debug

1. can you make the PR to main branch, right now we are doing some fixes on main 3.4 and develop has not been pumped up to 3.5 yet.
2. can you squash the commits to be only one commit with a message:
   [get_check_data] added developer documentation
   other wise I will do the squashing if I see more than one commit.

you might need to do the following. starting from your branch mydevelop

git remote add upstream https://github.com/pgRouting/pgrouting
git rebase -i upstream/main
# edit the file to squash the 2 commits and to change the commit message
# save the file and the rebase will be done
git push -f

and from this PR you made, change the base branch to main

[cvvergara]

Using #2432