DATAMONGO-1585 - Polishing.

Update documentation for better readability in html and pdf format.

Original Pull Request: #433

Author: christophstrobl

src/main/asciidoc/reference/mongodb.adoc

@@ -1739,21 +1739,29 @@ Note that one can also define fields with aliases via the static factory method
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 [source,java]
 ----
-project("name", "netPrice") // will generate {$project: {name: 1, netPrice: 1}}
-project().and("foo").as("bar") // will generate {$project: {bar: $foo}}
-project("a","b").and("foo").as("bar") // will generate {$project: {a: 1, b: 1, bar: $foo}}
+// will generate {$project: {name: 1, netPrice: 1}}
+project("name", "netPrice")
+
+// will generate {$project: {bar: $foo}}
+project().and("foo").as("bar")
+
+// will generate {$project: {a: 1, b: 1, bar: $foo}}
+project("a","b").and("foo").as("bar")
 ----
 ====
 
 .Multi-Stage Aggregation using Projection and Sorting
 ====
 [source,java]
 ----
-project("name", "netPrice"), sort(ASC, "name") // will generate {$project: {name: 1, netPrice: 1}}, {$sort: {name: 1}}
+// will generate {$project: {name: 1, netPrice: 1}}, {$sort: {name: 1}}
+project("name", "netPrice"), sort(ASC, "name")
 
-project().and("foo").as("bar"), sort(ASC, "bar") // will generate {$project: {bar: $foo}}, {$sort: {bar: 1}}
+// will generate {$project: {bar: $foo}}, {$sort: {bar: 1}}
+project().and("foo").as("bar"), sort(ASC, "bar")
 
-project().and("foo").as("bar"), sort(ASC, "foo") // this will not work
+// this will not work
+project().and("foo").as("bar"), sort(ASC, "foo")
 ----
 ====