Fix typo

src/sdr/_link_budget/_capacity.py

@@ -341,7 +341,7 @@ def shannon_limit_ebn0(rho: npt.ArrayLike) -> npt.NDArray[np.float64]:
 
  Notes:
  $$C = \rho = \log_2\left(1 + \frac{S}{N}\right) = \log_2\left(1 + \rho\frac{E_b}{N_0}\right) \ \ \text{bits/2D}$$
- $$\frac{E_b}{N_0} = \frac{2^{\rho} - 1}{\rho}$$\
+ $$\frac{E_b}{N_0} = \frac{2^{\rho} - 1}{\rho}$$
 
  Examples:
  The *absolute Shannon limit* on power efficiency is -1.59 dB $E_b/N_0$. This can only be achieved when the