docs: whitespace fix

doc.go

@@ -2,6 +2,6 @@
 // similar to what `sqlx` is to `database/sql`.
 //
 // It contains wrappers over gocql types that provide convenience methods which
-// are useful in the development of database driven applications.  Under the
+// are useful in the development of database driven applications. Under the
 // hood it uses sqlx/reflectx package so sqlx models will also work with gocqlx.
 package gocqlx