crypto/rsa: fix documentation formatting

Change-Id: I6a6a696422f9ab73b9ddee131b17d3c177fefc4e
Reviewed-on: https://go-review.googlesource.com/c/go/+/687615
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Roland Shoemaker <[email protected]>
Reviewed-by: Carlos Amedee <[email protected]>
Auto-Submit: Filippo Valsorda <[email protected]>

Author: FiloSottile

src/crypto/rsa/rsa.go

@@ -30,14 +30,15 @@
 // with a key smaller than 1024 bits. Such keys are insecure and should not be
 // used.
 //
-// The `rsa1024min=0` GODEBUG setting suppresses this error, but we recommend
-// doing so only in tests, if necessary. Tests can use [testing.T.Setenv] or
-// include `//go:debug rsa1024min=0` in a `_test.go` source file to set it.
+// The rsa1024min=0 GODEBUG setting suppresses this error, but we recommend
+// doing so only in tests, if necessary. Tests can set this option using
+// [testing.T.Setenv] or by including "//go:debug rsa1024min=0" in a *_test.go
+// source file.
 //
 // Alternatively, see the [GenerateKey (TestKey)] example for a pregenerated
 // test-only 2048-bit key.
 //
-// [GenerateKey (TestKey)]: #example-GenerateKey-TestKey
+// [GenerateKey (TestKey)]: https://pkg.go.dev/crypto/rsa#example-GenerateKey-TestKey
 package rsa
 
 import (
@@ -226,7 +227,7 @@ type CRTValue struct {
 // Validate performs basic sanity checks on the key.
 // It returns nil if the key is valid, or else an error describing a problem.
 //
-// It runs faster on valid keys if run after [Precompute].
+// It runs faster on valid keys if run after [PrivateKey.Precompute].
 func (priv *PrivateKey) Validate() error {
 	// We can operate on keys based on d alone, but it isn't possible to encode
 	// with [crypto/x509.MarshalPKCS1PrivateKey], which unfortunately doesn't
@@ -274,7 +275,7 @@ func checkPublicKeySize(k *PublicKey) error {
 // returned key does not depend deterministically on the bytes read from rand,
 // and may change between calls and/or between versions.
 //
-// [Minimum key size]: #hdr-Minimum_key_size
+// [Minimum key size]: https://pkg.go.dev/crypto/rsa#hdr-Minimum_key_size
 func GenerateKey(random io.Reader, bits int) (*PrivateKey, error) {
 	if err := checkKeySize(bits); err != nil {
 		return nil, err