chore: add missing comments for mongo client extensions

Author: the-avid-engineer

EntityDb.MongoDb/Extensions/IMongoClientExtensions.cs

@@ -4,8 +4,20 @@
 
 namespace EntityDb.MongoDb.Extensions
 {
+    /// <summary>
+    /// Extensions for the mongo client.
+    /// </summary>
     public static class IMongoClientExtensions
     {
+        /// <summary>
+        /// Provisions the needed collections on the database.
+        /// </summary>
+        /// <param name="mongoClient">The mongo client.</param>
+        /// <param name="entityName">The name of the entity, which is used as the database name.</param>
+        /// <returns>An asynchronous task that, when complete, signals that the collections have been provisioned.</returns>
+        /// <remarks>
+        /// You should ONLY use this in your code for integration testing. Real databases should be provisioned using the dotnet tool EntityDb.MongoDb.Provisioner.
+        /// </remarks>
         public static async Task ProvisionCollections(this IMongoClient mongoClient, string entityName)
         {
             var mongoDatabase = mongoClient.GetDatabase(entityName);