Clearly describe rm mv

[brntbeer]

@ZvikaZ, i wanted to bring this to your attention since it relates to the issue you opened (thank you by the way!)

@schacon you were last to edit this section, so I think you may be best to mention? What do you think of this addition? I know that in a nutshell section is basically repeating verbatim what was in the mv section, and I understand that rm and mv are essentially the same, but I think it could be misleading. Thoughts on accepting this?

closes#104

[brntbeer]

Ping @ZvikaZ and @schacon. Would love a 👍 from someone 😄

[brntbeer]

I know people from @git/team-gitscm aren't exactly team-gitref, but would anyone mind giving this the 👍 it needs?

Essentially I'm just moving the aside section to be before git mv because it is only referencing git rm. The in a nutshell section then is able to sum up both pieces, even though it originally wasnt intended too, I feel it's more clear (see #104 for more motivation)

[brntbeer]

🤷‍♂️