Minor beauty/consistensy fixes

Author: KronosTheLate

docs/src/basics/NonlinearProblem.md

@@ -2,9 +2,9 @@
 
 ## The Three Types of Nonlinear Problems
 
-NonlinearSolve.jl tackles two related types of nonlinear systems:
+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`.
+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, ∞)`.