Update documentation

[aniket2405]

Fixes Issue

Closes #959

Changes proposed

Update documentation:

1. Modifying the file name containing the list of known ports for Slips.
2. Adding the specific order in which the file ports_used_by_specific_orgs.csv is checked.

Steps you followed to test the changes purposed in this PR:

• NA. Documentation change.

Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.
• This PR does not contain plagiarized content.
• The title of my pull request is a short description of the requested changes.

Screenshots

N.A.

Note to reviewers

[AlyaGomaa]

hey @aniket2405 thanks for your effort! Keep it up.