Align MemoryStream Position and Seek to mention origin on ArgumentOutOfRangeException #9201

MemoryStream was recently fixed to avoid falling into a state where it could contain a negative Position dotnet/runtime#88572.

Some API docs don't mention the origin when they talk about ArgumentOutOfRangeException and only mention that the value must be between int.MaxValue and zero.

• Seek()
• Position

SetLength does correctly reflect that the limit accounts for the origin:

value is negative or is greater than the maximum length of the MemoryStream, where the maximum length is (Int32.MaxValue - origin), and origin is the index into the underlying buffer at which the stream starts.

We need to amend the former cases to align with SetLength's.