Fixed opensearch double slash issue

[LucidOne]

SUMMARY

The Opensearch url currently has an extra slash. note latest//search.html below.

ISSUE TYPE

• Docs Pull Request

COMPONENT NAME

docs, opensearch

ANSIBLE VERSION

n/a

ADDITIONAL INFORMATION

view-source:https://docs.ansible.com/ansible/latest/_static/opensearch.xml

<?xml version="1.0" encoding="UTF-8"?>
<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
  <ShortName>Ansible Documentation</ShortName>
  <Description>Search Ansible Documentation</Description>
  <InputEncoding>utf-8</InputEncoding>
  <Url type="text/html" method="get"
       template="https://docs.ansible.com/ansible/latest//search.html?q={searchTerms}&amp;check_keywords=yes&amp;area=default"/>
  <LongName>Ansible Documentation</LongName>
  
</OpenSearchDescription>

http://www.sphinx-doc.org/en/stable/config.html#confval-html_use_opensearch
"(without trailing slash)"

[ansibot]

cc @acozine
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