Update README.md

Author: ChrisRackauckas

README.md

@@ -287,7 +287,7 @@ FiniteDiff.finite_difference_derivative(f, x::T, fdtype::Type{T1}=Val{:central},
     returntype::Type{T2}=eltype(x), f_x::Union{Nothing,T}=nothing)
 ```
 
-## Multi-Point Derivatives
+## Multi-Dimensional Derivatives
 
 ### Differencing Calls
 
@@ -535,4 +535,4 @@ HessianCache(x,fdtype::Type{T1}=Val{:hcentral},
 HessianCache(xpp,xpm,xmp,xmm,
                       fdtype::Type{T1}=Val{:hcentral},
                       inplace::Type{Val{T2}} = x isa StaticArray ? Val{true} : Val{false})
-```
+```