Revert "Change Access modifier of WithAvailabilityStrategy from internal to public"

This reverts commit 2d93b9d.

Author: odera

Microsoft.Azure.Cosmos/src/Fluent/CosmosClientBuilder.cs

@@ -726,7 +726,12 @@ internal CosmosClientBuilder WithApiType(ApiType apiType)
         /// </summary>
         /// <param name="strategy"></param>
         /// <returns>The CosmosClientBuilder</returns>
-        public CosmosClientBuilder WithAvailabilityStrategy(AvailabilityStrategy strategy)
+#if PREVIEW
+        public
+#else
+        internal
+#endif
+        CosmosClientBuilder WithAvailabilityStrategy(AvailabilityStrategy strategy)
         {
             this.clientOptions.AvailabilityStrategy = strategy;
             return this;