static/frontend/homepage: update examples

The search examples on the homepage are updated to reflect the updated
search heuristics.

For golang/go#44142

Change-Id: I2154485580d6b3c43c87cf1169e72429d709c95a
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/348374
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>

static/frontend/homepage/homepage.tmpl

diff --git a/static/frontend/homepage/homepage.tmpl b/static/frontend/homepage/homepage.tmpl
index 5d42abb..533436e 100644
--- a/static/frontend/homepage/homepage.tmpl
+++ b/static/frontend/homepage/homepage.tmpl
@@ -52,7 +52,9 @@
           <a class="Homepage-exampleSearch" href="/search?q=http">“http”</a>
           <a class="Homepage-exampleSearch" href="/search?q=command">“command”</a>
           {{if .Experiments.IsActive "symbol-search"}}
-            <a class="Homepage-exampleSearch" href="/search?q=sql.DB&m={{.SearchModeSymbol}}">“{{.SearchModeSymbol}}:sql.DB”</a>
+            <a class="Homepage-exampleSearch" href="/search?q=Unmarshal">“Unmarshal”</a>
+            <a class="Homepage-exampleSearch" href="/search?q=sql.DB">“sql.DB”</a>
+            <a class="Homepage-exampleSearch" href="/search?q=%23error+golang.org%2Fx">“#error golang.org/x”</a>
           {{else}}
             <a class="Homepage-exampleSearch" href="/search?q=yaml+OR+json+OR+xml">“yaml OR json OR xml”</a>
           {{end}}