Incorrect captions in Chapter 3

Reported by a reader:

> I’m looking at the pdf of Version 2.6.3
> 
> Some small corrections:
> 
> Text: Figure 3.2: WS graphs with n = 20, k = 4, and p = 0 (left), p = 0.2 (middle), and p = 1 (right).
> 
> Should be: "n = 10” to match the figure
> 
> Similarly: Figure 3.2 shows WS graphs with n = 20, k = 4, and…
> 
> Should be: n = 10

Note: Update in 2nd and 3rd editions.