DOC Remove unneeded html_show_search_summary since True is the default (scikit-learn#29139)

Author: lesteve

doc/conf.py

@@ -456,9 +456,6 @@ def add_js_css_files(app, pagename, templatename, context, doctree):
 # See https://github.com/scikit-learn/scikit-learn/pull/22550
 html_context["is_devrelease"] = parsed_version.is_devrelease
 
-# Not showing the search summary makes the search page load faster.
-html_show_search_summary = True
-
 
 # -- Options for LaTeX output ------------------------------------------------
 latex_elements = {