Fix incorrect parameter references in ToBase64Transform (dotnet#10412)

Author: vcsjones

xml/System.Security.Cryptography/ToBase64Transform.xml

@@ -732,13 +732,13 @@ For more information about `Dispose` and `Finalize`, see [Cleaning Up Unmanaged
         </remarks>
         <exception cref="T:System.ObjectDisposedException">The current <see cref="T:System.Security.Cryptography.ToBase64Transform" /> object has already been disposed.</exception>
         <exception cref="T:System.Security.Cryptography.CryptographicException">The data size is not valid.</exception>
-        <exception cref="T:System.ArgumentException">The <paramref name="inputBuffer" /> parameter contains an invalid offset length.
+        <exception cref="T:System.ArgumentException">The <paramref name="inputOffset" /> parameter contains an invalid offset length.
 
  -or-
 
  The <paramref name="inputCount" /> parameter contains an invalid value.</exception>
         <exception cref="T:System.ArgumentNullException">The <paramref name="inputBuffer" /> parameter is <see langword="null" />.</exception>
-        <exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="inputBuffer" /> parameter requires a non-negative number.</exception>
+        <exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="inputCount" /> parameter requires a non-negative number and less than or equal to the length of <paramref name="inputBuffer"/>.</exception>
         <related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
       </Docs>
     </Member>
@@ -812,13 +812,13 @@ For more information about `Dispose` and `Finalize`, see [Cleaning Up Unmanaged
  ]]></format>
         </remarks>
         <exception cref="T:System.ObjectDisposedException">The current <see cref="T:System.Security.Cryptography.ToBase64Transform" /> object has already been disposed.</exception>
-        <exception cref="T:System.ArgumentException">The <paramref name="inputBuffer" /> parameter contains an invalid offset length.
+        <exception cref="T:System.ArgumentException">The <paramref name="inputOffset" /> parameter contains an invalid offset length.
 
  -or-
 
  The <paramref name="inputCount" /> parameter contains an invalid value.</exception>
         <exception cref="T:System.ArgumentNullException">The <paramref name="inputBuffer" /> parameter is <see langword="null" />.</exception>
-        <exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="inputBuffer" /> parameter requires a non-negative number.</exception>
+        <exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="inputCount" /> parameter requires a non-negative number and less than or equal to the length of <paramref name="inputBuffer"/>.</exception>
         <related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
       </Docs>
     </Member>