Fix formatting of efficiency value competency table

Why is this change being made?

The table of competencies for the Efficiency value currently has * and <br> tags which do not show up in the handbook. It looks something like this:

GitLab Job Grade	Demonstrates Efficiency Competency by…
5	*Developing an understanding of being a manager of 1: Take responsibility for your own tasks and deliver on commitments * Brings up ideas for process improvements to 1:1s. *Learns to write everything down as it is far more efficient to read a document at your convenience than to have to ask and explain.

This is unique in our credit values as the other ones are formatted in paragraph form.

This MR changes the bullet point *s to sentences and paragraphs. In some cases, I changed the wording slightly to make it more readable.

Author Checklist

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