reformat README

Signed-off-by: Sergei Malafeev <sergeymalafeev@gmail.com>

README.md

@@ -33,7 +33,7 @@ MongoClient mongoClient = new TracingAsyncMongoClient(tracer, ...);
 By default, span names are set to the operation performed by the Mongo client. To customize the span name, provide a MongoSpanNameProvider to the client that alters the span name. If a provder is not provided, the span name will remain the default.
 
 ```java
-//Create TracingMongoClient with custom span name
+// Create TracingMongoClient with custom span name
 TracingMongoClient client = new TracingMongoClient(
     tracer, 
     replicaSetAddresses, 
@@ -42,7 +42,7 @@ TracingMongoClient client = new TracingMongoClient(
     new PrefixSpanNameProvider("mongo."));
 Document doc = new Document();
 client.getDatabase("db").getCollection("collection).insertOne(doc);
-//Span name is now set to "mongo.insert"
+// Span name is now set to "mongo.insert"
 ```
 
 [ci-img]: https://travis-ci.org/opentracing-contrib/java-mongo-driver.svg?branch=master