openpgp: fix function name in comment

Change-Id: Ic788ebe311fafa0f5d9750d5f7f25fb70dc0606d
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/579175
Run-TryBot: shuang cui <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>

Author: cuishuang

openpgp/keys_test.go

@@ -132,7 +132,7 @@ func TestRevokedUserID(t *testing.T) {
 	}
 }
 
-// TestExternallyRevokableKey attempts to load and parse a key with a third party revocation permission.
+// TestExternallyRevocableKey attempts to load and parse a key with a third party revocation permission.
 func TestExternallyRevocableKey(t *testing.T) {
 	kring, err := ReadKeyRing(readerFromHex(subkeyUsageHex))
 	if err != nil {