Refactor contributions guide for improved readability

[bradlitterell]

Rewrap paragraph ending because the dash divider at the start of the line was incorrectly being interpreted as markdown bullet.

[gemini-code-assist]

Code Review

This pull request reformats a paragraph in the contributions guide (doc/contributions-guide.md). The review feedback suggests minor grammatical corrections, improving parallel structure, and removing trailing spaces, which has been provided as a concrete code suggestion.

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[gemini-code-assist]

There are a few minor grammatical and formatting issues in this paragraph:

1. There is an unnecessary comma in "style, and support requirements" (since it is a simple two-item conjunction, not a list of three or more).
2. The phrase "rather than have" is grammatically awkward here; "rather than having" flows better and maintains parallel structure.
3. There are trailing spaces at the end of lines 13 and 16.

Suggested change

	interest for including in the models. It is desirable that these
	augmentations - where they meet the style, and support requirements for
	including in the models - be included within the standard set of models,
	rather than have many different augmentations covering the same feature set.
	To this end, this document outlines a process for external contributions to OpenConfig.
	interest for including in the models. It is desirable that these
	augmentations - where they meet the style and support requirements for
	including in the models - be included within the standard set of models,
	rather than having many different augmentations covering the same feature set.
	To this end, this document outlines a process for external contributions to OpenConfig.