Remove over-specific and incorrect documentation about HMAC key lengths

Author: vcsjones

xml/System.Security.Cryptography/IncrementalHash.xml

@@ -449,13 +449,7 @@
       </Parameters>
       <Docs>
         <param name="hashAlgorithm">The name of the hash algorithm to perform within the HMAC.</param>
-        <param name="key">
-                The secret key for the HMAC. The key can be any length, but a key longer than the output size
-                of the hash algorithm specified by <paramref name="hashAlgorithm" /> will be hashed (using the
-                algorithm specified by <paramref name="hashAlgorithm" />) to derive a correctly-sized key. Therefore,
-                the recommended size of the secret key is the output size of the hash specified by
-                <paramref name="hashAlgorithm" />.
-            </param>
+        <param name="key">The secret key for the HMAC.</param>
         <summary>
             Create an <see cref="T:System.Security.Cryptography.IncrementalHash" /> for the Hash-based Message Authentication Code (HMAC)
             algorithm utilizing the hash algorithm specified by <paramref name="hashAlgorithm" />, and a
@@ -513,7 +507,7 @@
       </Parameters>
       <Docs>
         <param name="hashAlgorithm">The name of the hash algorithm to perform within the HMAC.</param>
-        <param name="key">The secret key for the HMAC. The key can be any length, but a key longer than the output size of the hash algorithm specified by <paramref name="hashAlgorithm" /> will be hashed (using the algorithm specified by <paramref name="hashAlgorithm" />) to derive a correctly-sized key. Therefore, the recommended size of the secret key is the output size of the hash specified by <paramref name="hashAlgorithm" />.</param>
+        <param name="key">The secret key for the HMAC.</param>
         <summary>Create an <see cref="T:System.Security.Cryptography.IncrementalHash" /> for the Hash-based Message Authentication Code (HMAC) algorithm utilizing the hash algorithm specified by <paramref name="hashAlgorithm" />, and a key specified by <paramref name="key" />.</summary>
         <returns>A hash instance to compute the hash algorithm specified by <paramref name="hashAlgorithm" />.</returns>
         <remarks>To be added.</remarks>