ImmutableArray<T>.ToBuilder method has incorrect remark

[joost-morsink]

The remarks section of the ToBuilder method of the ImmutableArray class (System.Collections.Immutable) incorrectly states it is an O(1) operation.
The implementation calls an AddRange on the Builder class, which is clearly O(n).

[svick]

I believe you are right. Do you want to submit a Pull Request to fix this? The relevant text is here:

dotnet-api-docs/xml/System.Collections.Immutable/ImmutableArray`1.xml

Lines 3690 to 3691 in 9a8ca60

	## Remarks
	This is an O(1) operation and results in only a single (small) memory allocation. The mutable list that is returned is not thread-safe.

[joost-morsink]

I Will. Probably on Friday.