[PATCH] help: document sharing of revlog header with revision 0

[Danek Duvall]

Gregory Szorc wrote:

> -Following the 32-bit header is *index* data. Inlined revision data is possibly
> -located between index entries. More on this layout is described below.
> +Following the 32-bit header is the remaining of the first index entry.

"remaining" -> "remainder"

Danek