Update contributing.md

contributing.md

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 Please ensure your pull request adheres to the following guidelines:
 
-- Search previous suggestions before making a new one, as yours may be a duplicate.
 - Make sure the list is useful before submitting. That implies it has enough content and every item has a good succinct description.
-- Make an individual pull request for each suggestion.
-- Use [title-casing](http://titlecapitalization.com) (AP style).
-- Use the following format: `[List Name](link)`
-- Link additions should be added to the bottom of the relevant category.
 - New categories or improvements to the existing categorization are welcome.
 - Check your spelling and grammar.
-- Make sure your text editor is set to remove trailing whitespace.
-- The pull request and commit should have a useful title.
-- The body of your commit message should contain a link to the repository.
 
 Thank you for your suggestions!