Use assembly visibility here

Per @bording suggestion.

Plus some drive by cosmetic comment changes.

Author: michaelklishin

projects/client/RabbitMQ.Client/src/client/api/SslOption.cs

@@ -75,7 +75,7 @@ public SslOption()
         }
 
         /// <summary>
-        /// Retrieve or set the set of ssl policy errors that are deemed acceptable.
+        /// Retrieve or set the set of TLS policy errors that are deemed acceptable.
         /// </summary>
         public SslPolicyErrors AcceptablePolicyErrors { get; set; }
 
@@ -90,13 +90,13 @@ public SslOption()
         public string CertPath { get; set; }
 
         /// <summary>
-        /// An optional client specified SSL certificate selection callback.  If this is not specified,
+        /// An optional client specified TLS certificate selection callback.  If this is not specified,
         /// the first valid certificate found will be used.
         /// </summary>
         public LocalCertificateSelectionCallback CertificateSelectionCallback { get; set; }
 
         /// <summary>
-        /// An optional client specified SSL certificate validation callback.  If this is not specified,
+        /// An optional client specified TLS certificate validation callback.  If this is not specified,
         /// the default callback will be used in conjunction with the <see cref="AcceptablePolicyErrors"/> property to
         /// determine if the remote server certificate is valid.
         /// </summary>
@@ -135,13 +135,13 @@ public X509CertificateCollection Certs
         public bool CheckCertificateRevocation { get; set; }
 
         /// <summary>
-        /// Flag specifying if Ssl should indeed be used.
+        /// Flag specifying if TLS should indeed be used.
         /// </summary>
         public bool Enabled { get; set; }
 
         /// <summary>
         /// Retrieve or set server's Canonical Name.
-        /// This MUST match the CN on the Certificate else the SSL connection will fail.
+        /// This MUST match the Subject Alternative Name or CN on the Certificate else the TLS connection will fail.
         /// </summary>
         public string ServerName { get; set; }
 
@@ -155,7 +155,7 @@ public X509CertificateCollection Certs
         /// Only used in environments where System.Security.Authentication.SslProtocols.None
         /// is unavailable or effectively disabled, as reported by System.Net.ServicePointManager.
         /// </summary>
-        public SslProtocols UseFallbackTlsVersions()
+        internal SslProtocols UseFallbackTlsVersions()
         {
             this.Version = SslProtocols.Tls12;
             return Version;