Word Choice – Use of ‘Omittance’ vs ‘Omission’

To omit George and not use someone or somebody, I think you would probably need to use the passive voice: Henry's eyes were carved out.

To omit George and use an active voice, you could try changing the verb. I'm not entirely sure of the context, but you could say something like: Henry suffered great violence to his eyes, wounds inflicted by a carving knife. Or if it is the case that you're talking about a sculpture, you could say: Henry's eyes came to life, as the carver continued working.

Edit, based on your revised question: To omit George and not use someone or somebody, I think you would probably need to use the passive voice: Henry's eyes were gouged out.

To omit George and use an active voice, you could try changing the verb. You could say something like: Henry suffered great violence to his eyes, wounds inflicted by a carving knife. Or Henry's eyes suffered horrific wounds inflicted by a knife.

Note that one of the reasons for using the passive voice is "to hide the identity of the agent (doer). The speaker/writer wants to be tactful or evasive." I think yours is an instance of this, so the passive "Henry's eyes were gouged out." may be your better option.

A design document is supposed to describe the design, not the current progress. The design stays the same, no matter how much of it is already implemented (or indeed whether anything at all gets implemented ever). So pick one tense and stick with it. For example,

• The file is in the X format.
• The user is prompted to Y.

And look — as chance would have it, I'm not using past or future tense there. (Though of course you could just as well use the future "tense" throughout.)