Correct typos in comments (#1017)

Author: eschnett

src/mapreduce.jl

@@ -274,10 +274,10 @@ _mean_denom(a, ::Type{Val{D}}) where {D} = size(a, D)
 @inline mean(a::StaticArray; dims=:) = _reduce(+, a, dims) / _mean_denom(a, dims)
 @inline mean(f::Function, a::StaticArray; dims=:) = _mapreduce(f, +, dims, _InitialValue(), Size(a), a) / _mean_denom(a, dims)
 
-@inline minimum(a::StaticArray; dims=:) = _reduce(min, a, dims) # base has mapreduce(idenity, scalarmin, a)
+@inline minimum(a::StaticArray; dims=:) = _reduce(min, a, dims) # base has mapreduce(identity, scalarmin, a)
 @inline minimum(f::Function, a::StaticArray; dims=:) = _mapreduce(f, min, dims, _InitialValue(), Size(a), a)
 
-@inline maximum(a::StaticArray; dims=:) = _reduce(max, a, dims) # base has mapreduce(idenity, scalarmax, a)
+@inline maximum(a::StaticArray; dims=:) = _reduce(max, a, dims) # base has mapreduce(identity, scalarmax, a)
 @inline maximum(f::Function, a::StaticArray; dims=:) = _mapreduce(f, max, dims, _InitialValue(), Size(a), a)
 
 # Diff is slightly different