Add ToC section title for CredHub integration doc
Add ToC section title for CredHub integration doc

[#152555095]

pivotal-cf/pcf-pipelines,pvsone/pcf-pipelines,sandyg1/pcf-pipelines,pivotal-cf/pcf-pipelines,sandyg1/pcf-pipelines,rahulkj/pcf-pipelines,pvsone/pcf-pipelines,sandyg1/pcf-pipelines,sandyg1/pcf-pipelines,rahulkj/pcf-pipelines,pvsone/pcf-pipelines,cah-josephgeorge/pcf-pipelines,pivotal-cf/pcf-pipelines,pivotal-cf/pcf-pipelines,cah-josephgeorge/pcf-pipelines,rahulkj/pcf-pipelines,rahulkj/pcf-pipelines,cah-josephgeorge/pcf-pipelines