ATLAS-3239: Fixed documentation error in Typesystem

docs/src/site/twiki/InstallationSteps.twiki

 ---++ Building & Installing Apache Atlas
 
 ---+++ Building Apache Atlas
-Download Apache Atlas 1.0.0 release sources, apache-atlas-1.0.0-sources.tar.gz, from [[http://atlas.apache.org/Downloads.html][downloads]] page.
+Download Apache Atlas 2.0.0 release sources, apache-atlas-2.0.0-sources.tar.gz, from [[http://atlas.apache.org/Downloads.html][downloads]] page.
 Then follow the instructions below to to build Apache Atlas.
 <verbatim>
-tar xvfz apache-atlas-1.0.0-sources.tar.gz
-cd apache-atlas-sources-1.0.0/
+tar xvfz apache-atlas-2.0.0-sources.tar.gz
+cd apache-atlas-sources-2.0.0/
 export MAVEN_OPTS="-Xms2g -Xmx2g"
 mvn clean -DskipTests install</verbatim>
 
@@ -81,7 +81,7 @@ bin/atlas_start.py</verbatim>
 <verbatim>
   curl -u username:password http://localhost:21000/api/atlas/admin/version
 
-  {"Description":"Metadata Management and Data Governance Platform over Hadoop","Version":"1.0.0","Name":"apache-atlas"}</verbatim>
+  {"Description":"Metadata Management and Data Governance Platform over Hadoop","Version":"2.0.0","Name":"apache-atlas"}</verbatim>
 
    * Run quick start to load sample model and data
 <verbatim>

docs/src/site/twiki/TypeSystem.twiki

@@ -173,7 +173,7 @@ make convention based assumptions about what attributes they can expect of types
 *Infrastructure*: This type extends Asset and typically can be used to be a common super type for infrastructural
 metadata objects like clusters, hosts etc.
 
-*!DataSet*: This type extends Referenceable. Conceptually, it can be used to represent an type that stores data. In Atlas,
+*!DataSet*: This type extends Asset. Conceptually, it can be used to represent a type that stores data. In Atlas,
 hive tables, hbase_tables etc are all types that extend from !DataSet. Types that extend !DataSet can be expected to have
 a Schema in the sense that they would have an attribute that defines attributes of that dataset. For e.g. the columns
 attribute in a hive_table. Also entities of types that extend !DataSet participate in data transformation and this