doc: fix crypto Verify cut-n-paste from Sign

Verify documentation had cut-n-pasted documentation from Sign.

PR-URL: https://github.com/nodejs/node/pull/9796
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Prince John Wesley <princejohnwesley@gmail.com>

doc/api/crypto.md

@@ -925,8 +925,8 @@ of two ways:
 - Using the [`verify.update()`][] and [`verify.verify()`][] methods to verify
   the signature.
 
-  The [`crypto.createSign()`][] method is used to create `Sign` instances.
-  `Sign` objects are not to be created directly using the `new` keyword.
+The [`crypto.createVerify()`][] method is used to create `Verify` instances.
+`Verify` objects are not to be created directly using the `new` keyword.
 
 Example: Using `Verify` objects as streams: