Improve clarity of commit message convention section of CONTRIBUTING.md

[dominicduffin1]

Context for documentation change

Noticed that the git subject line sentence could have a clearer demarcation of the part to be completed.

Proposed solution

I suggest replacing `If applied, this commit will your subject line here` with `If applied, this commit will <your subject line here>`

See here in the read me for how to run and install the application.

See here in contributing for the basics on forking and cloning the repository.

styled after article written by Andy Cochran

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