doc: remove old OpenSSL ENGINE constants

These constants have not existed since OpenSSL 1.1.0 reached EOL a few
years ago.

Refs: #19794
PR-URL: #44589
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

doc/api/crypto.md

@@ -5263,12 +5263,6 @@ is a bit field taking one of or a mix of the following flags (defined in
 * `crypto.constants.ENGINE_METHOD_ALL`
 * `crypto.constants.ENGINE_METHOD_NONE`
 
-The flags below are deprecated in OpenSSL-1.1.0.
-
-* `crypto.constants.ENGINE_METHOD_ECDH`
-* `crypto.constants.ENGINE_METHOD_ECDSA`
-* `crypto.constants.ENGINE_METHOD_STORE`
-
 ### `crypto.setFips(bool)`
 
 <!-- YAML