search: refinements to Advanced Search Tips

* Add quotes in search query example data_abstract:"CERN-LHC".
* Replace "resources.description" with just "resources" in link.

hepdata/modules/search/templates/hepdata_search/modals/search_help.html

@@ -47,7 +47,8 @@ <h4>Search on title, abstract, or record abstract</h4>
  <br/>(i.e. the <em>"comment"</em> in the <em>submission.yaml</em> file)
  <ul>
  <li>
- <a href='/search?q=data_abstract:CERN-LHC' target="_new">data_abstract:CERN-LHC</a>
+ <a href='/search?q=data_abstract:"CERN-LHC"' target="_new">data_abstract:"CERN-LHC"</a>
+ <br/><span class="text-muted">Quotes force a full match.</span>
  </li>
  </ul>
  </li>
@@ -120,7 +121,7 @@ <h4>Searching resources by field</h4>
  <li>Text-based description searching:
  <ul>
  <li>
- <a href='/search?q=resources.description:"Created with hepdata_lib"' target="_new">resources:"Created with hepdata_lib"</a>
+ <a href='/search?q=resources:"Created with hepdata_lib"' target="_new">resources:"Created with hepdata_lib"</a>
  <br/><span class="text-muted">Quotes force a full match.</span>
  </li>
  </ul>