I have a couple visualforce pages that show a title in my browser 'Documentations' that I can't figure out why.

Here's an example of one page:

    

I have a couple visualforce pages that show a title in my browser 'Documentations' that I can't figure out why.

Here's an example of one page:

    <apex:page standardController="Opportunity"  showHeader="true" sidebar="false" title="Prospect">  
      
    
         <style>
          .activeTab {background-color: #236FBf;  color:white; background-image:none}
          .inactiveTab { background-color: white; color:black; background-image:none}
       </style>
       <apex:tabPanel switchType="client" selectedTab=" tabdetails" id="OpportunityTabPanel" tabClass="activeTab" inactiveTabClass="inactiveTab">   
       
       
        <apex:tab label="Details" name="OpportunityDetails" id="tabdetails">
             <apex:detail relatedList="false" title="true"/>
          </apex:tab>
       
       
       <apex:tab label="Approval Process" name="Approval" id="tabApproval">
             <apex:relatedList list="ProcessSteps" ></apex:relatedList>
    
          </apex:tab>
          
          
           <apex:tab label="Activity History" name="Activities" id="tabActivities">
             <apex:relatedList list="activityhistories" ></apex:relatedList>
    
          </apex:tab>
          
       
        <apex:tab label="Chatter Feed" name="Feed" id="Feed">
              <chatter:feed entityId="{!Opportunity.Id}"/>
          </apex:tab>
      
        <apex:tab label="Connecitvity" name="Comm" id="Comm">
              <apex:include pageName="OppCommRoutingMDConnect"/>
          </apex:tab>
      
      </apex:tabPanel>
    </apex:page>

Here's one example of in browser:

I have not renamed Opportunity object.

The word Documentations does not even appear in this page or its sub pages!