Update index.html

fix version number.

Author: Jeff McCormick

docs/installation/manual-installation/index.html

@@ -258,7 +258,7 @@ <h2 id="_project_structure">Project Structure</h2>
 export COROOT=$GOPATH/src/github.com/crunchydata/postgres-operator
 export CO_IMAGE_PREFIX=crunchydata
 export CO_BASEOS=centos7
-export CO_VERSION=3.2
+export CO_VERSION=3.2.0
 export CO_IMAGE_TAG=centos7-$CO_VERSION
 export PGO_CA_CERT=$COROOT/conf/apiserver/server.crt
 export PGO_CLIENT_CERT=$COROOT/conf/apiserver/server.crt
@@ -702,4 +702,4 @@ <h2 id="_next_steps">Next Steps</h2>
 
 
   </body>
-</html>
+</html>