doc: fix typo in interface manual section (#44703)

doc/src/manual/interfaces.md

@@ -258,7 +258,7 @@ provides a traits-based mechanism to enable efficient generic code for all array
 
 This distinction determines which scalar indexing methods the type must define. `IndexLinear()`
 arrays are simple: just define `getindex(A::ArrayType, i::Int)`.  When the array is subsequently
-indexed with a multidimensional set of indices, the fallback `getindex(A::AbstractArray, I...)()`
+indexed with a multidimensional set of indices, the fallback `getindex(A::AbstractArray, I...)`
 efficiently converts the indices into one linear index and then calls the above method. `IndexCartesian()`
 arrays, on the other hand, require methods to be defined for each supported dimensionality with
 `ndims(A)` `Int` indices. For example, [`SparseMatrixCSC`](@ref) from the `SparseArrays` standard