Update xml/System.IO/StreamReader.xml

Co-authored-by: David Cantú <[email protected]>

Author: ViveliDuCh

xml/System.IO/StreamReader.xml

@@ -1008,7 +1008,7 @@
         <exception cref="T:System.ArgumentNullException">
           <paramref name="stream" /> or <paramref name="encoding" /> is <see langword="null" />.</exception>
         <exception cref="T:System.ArgumentOutOfRangeException">
-          <paramref name="bufferSize" /> is less than or equal to zero, except for -1, which is allowed in stream-based constructors to indicate the default buffer size.</exception>
+          <paramref name="bufferSize" /> is less than or equal to zero, except for -1, which is allowed to indicate the default buffer size.</exception>
         <altmember cref="T:System.Text.Encoding" />
         <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>