static/frontend/search: change h1 for package mode

The h1 for package mode is changed to "Packages matching <query>" to
match the h1 for symbol mode.

For golang/go#44142

Change-Id: I7de93ca7796a4c13552d0ca5751d3818f503fe9d
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/346112
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
Reviewed-by: Jamal Carvalho <jamal@golang.org>
diff --git a/static/frontend/search/search.tmpl b/static/frontend/search/search.tmpl
index e78c83e..3cd5313 100644
--- a/static/frontend/search/search.tmpl
+++ b/static/frontend/search/search.tmpl
@@ -77,7 +77,7 @@
 {{end}}
 
 {{define "search_package"}}
-  <h1>Search results for “{{.Query}}”</h1>
+  <h1>{{capitalize .SearchModePackage}}s matching “{{.Query}}”</h1>
   <a class="SearchResults-instead" data-gtmc="toggle search mode" href="{{.Pagination.URL .Pagination.Limit .SearchModeSymbol .Query}}">
     <span class="SearchResults-insteadPrefix">Search instead for </span>“{{.SearchModeSymbol}}: {{.Query}}”
   </a>