Changed img tag on CONTRIBUTING.md pg

[mocodesss]

Fixes #7835

What changes did you make?

• Line 981 of the CONTRIBUTING.md, updated this:
  If your images are too big, use the <img src="" width="" length="" /> syntax instead of ![image](link) to format the images
  .... to this:
  If your images are too big, use the <img src="" width="" length=""> syntax instead of ![image](link) to format the images

Why did you make the changes (we will use this info to test)?

• We use HTML tags with no ending slashes in the code base because the tag is self-closing. I updated this so the code base is consistent.

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Note that CONTRIBUTING.md cannot previewed locally; rather it should be previewed at this URL:

https://github.com/mocodesss/website/blob/7835-img-tag-refactor-CONT-31biv/CONTRIBUTING.md  

[t-will-gillis]

• Please see the note on img tag refactor in CONTRIBUTING.md Section 3.1.b, iv #7835