Align MemoryStream Position and Seek docs with SetLength

 Updated ArgumentOutOfRangeException documentation for Position
  property and Seek method to include the more precise explanation
  about the maximum length calculation that accounts for the origin
  parameter.

  Both now match the detailed description in SetLength, specifying
  that the maximum length is (Int32.MaxValue - origin), where origin
  is the index into the underlying buffer at which the stream starts.

  Fixes #9201

Author: oii-nasif

xml/System.IO/MemoryStream.xml

@@ -1800,7 +1800,7 @@ The pending operation does not support writing.</exception>
 
  ]]></format>
         </remarks>
-        <exception cref="T:System.ArgumentOutOfRangeException">The position is set to a negative value or a value greater than <see cref="F:System.Int32.MaxValue">Int32.MaxValue</see>.</exception>
+        <exception cref="T:System.ArgumentOutOfRangeException">The position is set to a negative value or a value greater than the maximum length of the <see cref="T:System.IO.MemoryStream" />, where the maximum length is (<see cref="F:System.Int32.MaxValue">Int32.MaxValue</see> - <code>origin</code>), and <code>origin</code> is the index into the underlying buffer at which the stream starts.</exception>
         <exception cref="T:System.ObjectDisposedException">The stream is closed.</exception>
         <related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
         <related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
@@ -2244,7 +2244,7 @@ The pending operation does not support writing.</exception>
         </remarks>
         <exception cref="T:System.IO.IOException">Seeking is attempted before the beginning of the stream.</exception>
         <exception cref="T:System.ArgumentOutOfRangeException">
-          <paramref name="offset" /> is greater than <see cref="F:System.Int32.MaxValue">Int32.MaxValue</see>.</exception>
+          <paramref name="offset" /> is greater than the maximum length of the <see cref="T:System.IO.MemoryStream" />, where the maximum length is (<see cref="F:System.Int32.MaxValue">Int32.MaxValue</see> - <code>origin</code>), and <code>origin</code> is the index into the underlying buffer at which the stream starts.</exception>
         <exception cref="T:System.ArgumentException">There is an invalid <see cref="T:System.IO.SeekOrigin" />.
 
  -or-