Update docs/src/basics/NonlinearProblem.md

Author: ChrisRackauckas

docs/src/basics/NonlinearProblem.md

@@ -7,7 +7,7 @@ NonlinearSolve.jl tackles three related types of nonlinear systems:
 1. Interval rootfinding problems. I.e., find the ``t \in [t_0, t_f]`` such that `f(t) = 0`.
 2. Systems of nonlinear equations, i.e. find the `u` such that `f(u) = 0`.
 3. Steady state problems, i.e. find the `u` such that `u' = f(u,t)` has reached steady state,
-   i.e. `0 = f(u, ∞)`.
+   i.e. ``0 = f(u, ∞)``.
 
 The first is for solving scalar rootfinding problems, i.e. finding a single number, and
 requires that a bracketing interval is known. For a bracketing interval, one must have that