x/pkgsite: expect search for x509 to find the stdlib package

[eliben]

What is the URL of the page with the issue?

https://pkg.go.dev/search?q=x509

What is your user agent?

Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:90.0) Gecko/20100101 Firefox/90.0

What did you do?

Search for "x509" in the search box.

What did you expect to see?

The crypto/x509 package (https://pkg.go.dev/crypto/x509) at the top or at least near the top

What did you see instead?

The 10 first results don't contain crypto/x509:

github.com/google/certificate-transparency-go/x509

Package x509 parses X.509-encoded keys and certificates.
Version: v1.1.1 | Published: Oct 6, 2020 | Imported by: 373 | License: Apache-2.0
k8s.io/apiserver/pkg/authentication/request/x509

Package x509 provides a request authenticator that validates and extracts user information from client certificates
Version: v0.22.0 | Published: today | Imported by: 132 | License: Apache-2.0
github.com/google/certificate-transparency-go/x509util

Package x509util includes utility code for working with X.509 certificates from the x509 package.
Version: v1.1.1 | Published: Oct 6, 2020 | Imported by: 122 | License: Apache-2.0
github.com/zmap/zcrypto/x509

Version: v0.0.0-...-3c30cdc | Published: 2 days ago | Imported by: 97 | Licenses: Apache-2.0, ISC, MIT
github.com/Cloud-Foundations/Dominator/lib/srpc

Package srpc is similar to the net/rpc package in the Go standard library, except that it provides streaming RPC access, TLS support and authentication and authorisation using X509 client certificates.
Version: v0.0.0-...-a725685 | Published: May 24, 2021 | Imported by: 258 | License: Apache-2.0
github.com/google/certificate-transparency-go/x509/pkix

Package pkix contains shared, low level structures used for ASN.1 parsing and serialization of X.509 certificates, CRL and OCSP.
Version: v1.1.1 | Published: Oct 6, 2020 | Imported by: 63 | License: Apache-2.0
github.com/cetcxinlian/cryptogm/x509

Package x509 parses X.509-encoded keys and certificates.
Version: v0.0.0-...-f3ca35d | Published: Aug 6, 2020 | Imported by: 25 | License: Apache-2.0
github.com/Hyperledger-TWGC/tjfoc-gm/x509

crypto/x509 add sm2 support
Version: v1.4.0 | Published: Jan 4, 2021 | Imported by: 47 | License: Apache-2.0
github.com/fabric-creed/cryptogm/x509

Package x509 parses X.509-encoded keys and certificates.
Version: v0.0.0-...-9b28f0c | Published: Jun 21, 2021 | Imported by: 15 | License: Apache-2.0
github.com/zmap/zcrypto/x509/pkix

Package pkix contains shared, low level structures used for ASN.1 parsing and serialization of X.509 certificates, CRL and OCSP.
Version: v0.0.0-...-3c30cdc | Published: 2 days ago | Imported by: 27 | Licenses: Apache-2.0, ISC, MIT

[cespare]

Duplicate of #47555.